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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 30, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	Enphase Energy, Inc.
Entity Central Index Key	0001463101
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		41,619,628

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 36,434	$ 45,294
Accounts receivable, net of allowances of $1,024 and $1,177, respectively	24,908	27,743
Inventory	22,309	19,843
Prepaid expenses and other	2,492	2,118
Total current assets	86,143	94,998
Property and equipment, net	25,281	25,541
Other assets	1,641	1,752
Total assets	113,065	122,291
Current liabilities:
Accounts payable	9,057	11,272
Accrued liabilities	18,521	19,266
Deferred revenues	1,068	933
Current portion of term loans	2,440	2,384
Total current liabilities	31,086	33,855
Long-term liabilities:
Deferred revenues	8,378	7,537
Warranty obligations	17,094	15,260
Other liabilities	352	307
Term loans	8,046	8,677
Total liabilities	64,956	65,636
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.00001 par value, 10,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value, 100,000 shares authorized; 41,393 and 40,856 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively	0	0
Additional paid-in capital	185,667	183,629
Accumulated deficit	(137,432)	(127,026)
Accumulated other comprehensive income (loss)	(126)	52
Total stockholders’ equity	48,109	56,655
Total liabilities and stockholders’ equity	$ 113,065	$ 122,291

Condensed Consolidated Balance Sheets (Unaudited ) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Allowances, accounts receivable	$ 1,024	$ 1,177
Common stock, par value (usd per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	41,393,000	40,856,000
Common stock, shares outstanding	41,393,000	40,856,000
Preferred stock, par value (usd per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net revenues	$ 45,577	$ 42,600
Cost of revenues	33,376	33,293
Gross profit	12,201	9,307
Operating expenses:
Research and development	9,026	7,842
Sales and marketing	6,850	5,049
General and administrative	6,036	5,696
Total operating expenses	21,912	18,587
Loss from operations	(9,711)	(9,280)
Other income (expense), net:
Interest expense	(464)	(1,479)
Other income (expense)	(49)	640
Total other expense, net	(513)	(839)
Loss before income taxes	(10,224)	(10,119)
Provision for income taxes	(182)	(65)
Net loss attributable to common stockholders	$ (10,406)	$ (10,184)
Net loss per share attributable to common stockholders, basic and diluted (usd per share)	$ (0.25)	$ (5.97)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	41,149	1,706

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net loss attributable to common stockholders	$ (10,406)	$ (10,184)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(178)	28
Comprehensive loss attributable to common stockholders	$ (10,584)	$ (10,156)

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

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+ Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (10,406)	$ (10,184)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,660	1,085
Non-cash interest expense	108	937
Stock-based compensation	1,435	706
Change in fair value of convertible preferred stock warrants	0	(623)
Changes in operating assets and liabilities:
Accounts receivable	2,835	4,324
Inventory	(2,466)	(14,433)
Prepaid expenses and other assets	(355)	(913)
Accounts payable, accrued and other liabilities	(759)	11,222
Deferred revenues	976	(6,192)
Net cash used in operating activities	(6,972)	(14,071)
Cash flows from investing activities:
Purchases of property and equipment	(1,682)	(4,605)
Net cash used in investing activities	(1,682)	(4,605)
Cash flows from financing activities:
Proceeds from term loans and debt	0	2,600
Repayments of term loans	(591)	(3,287)
Principal payments under capital leases	(40)	(31)
Proceeds from the exercise of stock options	603	24
Payment of offering costs	0	(279)
Net cash used in financing activities	(28)	(973)
Effect of exchange rate changes on cash	(178)	28
Net decrease in cash and cash equivalents	(8,860)	(19,621)
Cash and cash equivalents—Beginning of period	45,294	51,524
Cash and cash equivalents—End of period	36,434	31,903
Supplemental disclosures of cash flow information:
Cash paid for interest	388	514
Noncash financing and investing activities:
Purchases of property and equipment included in accounts payable	490	1,708
Offering costs not yet paid	$ 0	$ 1,753

Overview and Summary of Significant Accounting Policies	3 Months Ended
Overview and Summary of Significant Accounting Policies	Mar. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview and Summary of Significant Accounting Policies	Overview and Summary of Significant Accounting Policies The Company Enphase Energy, Inc. ("Enphase" or the “Company”) designs, develops, and sells microinverter systems for the solar photovoltaic industry. The Company’s microinverter system consists of (i) an Enphase microinverter and related accessories that convert direct current (“DC”) power to grid-compliant alternating current (“AC”) power; (ii) an Envoy communications gateway device that collects and transmits performance information from each solar module to the Company’s hosted data center; and (iii) the Enlighten web-based software platform that collects and processes this information to enable customers to monitor and manage their solar power systems. The Company sells microinverter systems primarily to distributors who resell them to solar installers. The Company also sells directly to large installers as well as through original equipment manufacturers (“OEMs”) and strategic partners. On April 4, 2012, the Company completed its initial public offering ("IPO"), issuing 10,315,151 shares of common stock at an offering price of $6.00 per share. The net proceeds from the sale of the shares were $53.8 million, after deducting the underwriters’ discounts and commissions of $3.3 million and other offering costs of $4.8 million. Upon consummation of the IPO, the Company’s 22,220,856 outstanding shares of convertible preferred stock were automatically converted into 25,171,017 shares of common stock, and the $21.2 million outstanding balance of principal and accrued paid-in-kind interest in convertible notes were automatically converted into 3,533,988 shares of common stock at a conversion price equal to the IPO price of $6.00 per share Basis of Presentation, Consolidation and Related Party Transactions The accompanying condensed consolidated financial statements are presented in accordance with United States generally accepted accounting principles (“U.S. GAAP”). The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in the consolidation. The Company recognized revenues of $2.6 million for the three months ended March 31, 2012 from sales of microinverters to entities that are majority-owned by KPCB Holdings, Inc., as nominee ("KPCB"), a related party which has a significant ownership interest in the Company. Unaudited Interim Financial Information These accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial reporting. In the opinion of management, these unaudited condensed consolidated interim financial statements reflect all adjustments, consisting of normal recurring items, considered necessary to present fairly the Company's financial condition, results of operations, comprehensive loss and cash flows for the periods indicated. The results of operations for the three months ended March 31, 2013 are not necessarily indicative of the operating results for the full year. Certain information and footnote disclosures typically included in annual consolidated financial statements have been condensed or omitted. Accordingly, these unaudited interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2012. Significant Accounting Policies There have been no material changes in the Company's significant accounting policies as of and for the three months ended March 31, 2013, as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2012. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events, and apply judgments that affect the reported amounts of assets, liabilities, revenue, expenses and the related disclosures. Significant estimates and assumptions reflected in the financial statements include revenue recognition, inventory valuation and accrued warranty obligations. Actual results could differ from those estimates.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

+ References + Details

Inventory

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

INVENTORY

Inventory as of March 31, 2013 and December 31, 2012 consists of the following (in thousands):



	March 31, 2013		December 31, 2012
Raw materials	$	1,964	$	2,223
Finished goods	20,345		17,620
Total inventory	$	22,309	$	19,843

Warranty Obligations

3 Months Ended

Mar. 31, 2013

Product Warranties Disclosures [Abstract]

WARRANTY OBLIGATIONS

Changes in the Company’s warranty obligations during the three months ended March 31, 2013 and 2012 were as follows (in thousands):



	Three Months Ended March 31,
	2013			2012
Balance, at beginning of period	$	21,338		$	8,738
Warranty expense	3,525			2,109
Settlements	(968		)	(283		)
Balance, at end of period	23,895			10,564
Less current portion included in accrued liabilities	(6,801		)	(2,687		)
Long-term portion	$	17,094		$	7,877

Fair Value Measurements

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE OF FINANCIAL INSTRUMENTS

The accounting guidance defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance.

The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. An asset’s or liability’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:


•	Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company is able to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of such assets or liabilities do not entail a significant degree of judgment.


•	Level 2—Valuations based on one or more quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.


•	Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

Derivative Instruments—The Company utilizes foreign currency forward contracts to reduce the impact of foreign currency fluctuations related to anticipated cash receipts from expected future revenues denominated in Euros and intercompany transaction gains or losses. As of March 31, 2013 and December 31, 2012, the aggregate gross notional amounts of outstanding foreign currency forward contracts denominated in Euros, all with maturities of less than six months, were $7.5 million and $6.1 million, respectively.

The following table presents the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy at March 31, 2013 and December 31, 2012 (in thousands):



	Asset Derivatives				Liability Derivatives
	March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Foreign currency forward contracts (Level 2)	$	150	$	—	$	64	$	268

For the three months ended March 31, 2013, the Company recognized a net gain of $86,000 related to foreign currency forward contracts.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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-Number 157
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Long-Term Debt

3 Months Ended

Mar. 31, 2013

Long-term Debt, by Current and Noncurrent [Abstract]

LONG-TERM DEBT

The Company’s long-term debt at March 31, 2013 and December 31, 2012 consists of the following (in thousands):



	March 31, 2013			December 31, 2012
Term loans	$	7,400		$	7,400
Equipment financing facility, net of unamortized discount of $78 and $94, respectively	3,086			3,661
Total debt	10,486			11,061
Less current portion	(2,440		)	(2,384		)
Long-term portion	$	8,046		$	8,677

As of March 31, 2013, the Company was a party to three debt agreements: (i) the $50.0 million revolving credit facility ("the Revolver") with Wells Fargo Bank, N.A., (ii) the facility with Hercules Technology Growth Capital, Inc. (“Hercules Facility”) consisting of a $7.4 million initial term loan and lending commitments of up to $15.6 million in additional term loans, and (iii) the $5.0 million equipment financing facility, also with Hercules. As of March 31, 2013, the Company has not drawn upon the Revolver or additional term loans available under the Hercules Facility. Each of these debt agreements is described in greater detail in the consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2012.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Contingencies —From time to time, the Company may be involved in litigation relating to claims arising out of its operations. The Company is not currently involved in any material legal proceedings. The Company may, however, be involved in material legal proceedings in the future. Such matters are subject to uncertainty and there can be no assurance that such legal proceedings will not have a material adverse effect on its business, results of operations, financial position or cash flows.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock-Based Compensation

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

The Company has adopted certain equity incentive and stock purchase plans as described in the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.

Stock Options

The following is a summary of stock option activity for the three months ended March 31, 2013 (in thousands, except per share data):



	Number of Shares Outstanding		Weighted- Average Exercise Price per Share
Options outstanding—December 31, 2012	8,169		$	3.28
Granted	114		4.93
Exercised	(527	)	1.14
Canceled	(73	)	8.06
Options outstanding—March 31, 2013	7,683		3.41

Restricted Stock Units

The following is a summary of restricted stock unit activity for the three months ended March 31, 2013 (in thousands, except per share data):



	Restricted Stock Units		Weighted Average Fair Value per Share at Grant Date
Outstanding at December 31, 2012	248		$	5.53
Granted	20		4.92
Vested	(10	)	6.79
Canceled	(3	)	6.90
Outstanding at March 31, 2013	255		5.42

Stock-Based Compensation Expense

The following table summarizes the components of total stock-based compensation expense included in the condensed consolidated statements of operations for the periods presented (in thousands):



	Three Months Ended March 31,
	2013		2012
Cost of revenues	$	108	$	20
Research and development	478		273
Sales and marketing	378		195
General and administrative	471		218
Total	$	1,435	$	706

The following table summarizes stock-based compensation associated with each type of award for the periods presented (in thousands):



	Three Months Ended March 31,
	2013		2012
Stock options and restricted stock units	$	1,285	$	706
Employee Stock Purchase Plan	150		—
Total	$	1,435	$	706

Valuation Assumptions

The fair value of options granted to employees for purposes of calculating stock-based compensation expense is estimated on the grant date using the Black-Scholes option-pricing model. This valuation model requires the Company to make assumptions and judgments about the inputs used in the calculation, including the expected term (weighted-average period of time that the options granted are expected to be outstanding), the volatility of the Company’s common stock, a risk-free interest rate, and expected dividend yield. The expected term for an option grant is calculated based on the simplified method. The expected volatility is based on an average of the historical volatilities of the common stock of several entities with characteristics similar to those of the Company. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. The Company’s expected dividend yield input was zero as it has not historically paid, nor does it expect in the future to pay, cash dividends on its common stock.

The fair value of each option granted during the periods presented was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:



	Three Months Ended March 31,
	2013			2012
Expected term (in years)	4.7			6.0
Expected volatility	73.0		%	70.9		%
Annual risk-free rate of return	0.8		%	1.1		%
Dividend yield	—		%	—		%
Weighted average grant date fair value	$	2.85		$	6.80

As of March 31, 2013, there was approximately $12.0 million of total unrecognized compensation cost related to unvested equity awards expected to be recognized over a weighted-average period of 2.6 years.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2013
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES No provision for U.S. federal or state income taxes has been made due to cumulative losses since the commencement of operations. A provision for income taxes of $182,000 and $65,000 has been recognized for the three months ended March 31, 2013 and 2012, respectively, related to the Company’s subsidiaries located outside of the United States.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 740
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-Section 50
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Loss Per Share Attributable to Common Stockholders

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS

In April 2012, all of the Company’s then outstanding convertible preferred stock automatically converted into common stock in connection with its initial public offering. For periods that ended prior to the conversion, basic and diluted net income per common share were presented in conformity with the two-class method required for participating securities.

Under the two-class method, net loss is allocated between common shares and other participating securities to the extent that the securities are required to share in the losses. The Company’s convertible preferred stock did not meet the definition of a participating security in periods of net losses as the convertible preferred stockholders did not have a contractual obligation to share in the Company’s losses. Accordingly, net losses were attributable to common stockholders. Subsequent to the IPO and the automatic conversion of the outstanding convertible preferred stock, the Company had no other participating securities and the two-class method is no longer applicable.

Basic net loss per share attributable to common stockholders is calculated by dividing net loss attributable to common stockholders by the weighted average number of shares outstanding for the period. The disproportional change in loss per share for the three months ended March 31, 2013, as compared to the same period in the prior year, is attributed to the effect of the IPO of 10.3 million shares of its common stock. In addition, the IPO also effected the automatic conversion of the Company's convertible preferred stock and convertible notes into 28.7 million shares of its common stock.

Diluted net loss per share attributable to common stockholders is calculated by dividing net loss attributable to common stockholders by the weighted average number of common shares and potential dilutive common share equivalents outstanding during the period if the effect is dilutive. The Company’s potentially dilutive common shares include convertible notes and convertible preferred stock prior to their conversion, outstanding stock options and warrants, shares issuable pursuant to the ESPP and non-vested restricted stock units.

The following table presents the potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders for the three months ended March 31, 2013 and 2012, respectively, because including them would have been anti-dilutive (in thousands):



	Three Months Ended March 31,
	2013	2012
Stock options to purchase common stock	7,908	6,502
Restricted stock units	247	—
Warrants to purchase common stock	331	132
Warrants to purchase convertible preferred stock	—	187
Convertible preferred stock	—	25,171
Convertible notes	—	3,530
Total	8,486	35,522

Overview and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation, Consolidation and Related Party Transactions	Basis of Presentation, Consolidation and Related Party Transactions The accompanying condensed consolidated financial statements are presented in accordance with United States generally accepted accounting principles (“U.S. GAAP”). The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in the consolidation. The Company recognized revenues of $2.6 million for the three months ended March 31, 2012 from sales of microinverters to entities that are majority-owned by KPCB Holdings, Inc., as nominee ("KPCB"), a related party which has a significant ownership interest in the Company.
Unaudited Interim Financial Information	Unaudited Interim Financial Information These accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial reporting. In the opinion of management, these unaudited condensed consolidated interim financial statements reflect all adjustments, consisting of normal recurring items, considered necessary to present fairly the Company's financial condition, results of operations, comprehensive loss and cash flows for the periods indicated. The results of operations for the three months ended March 31, 2013 are not necessarily indicative of the operating results for the full year. Certain information and footnote disclosures typically included in annual consolidated financial statements have been condensed or omitted. Accordingly, these unaudited interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2012.
Significant Accounting Policies	Significant Accounting Policies There have been no material changes in the Company's significant accounting policies as of and for the three months ended March 31, 2013, as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2012.
Use of Estimates	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events, and apply judgments that affect the reported amounts of assets, liabilities, revenue, expenses and the related disclosures. Significant estimates and assumptions reflected in the financial statements include revenue recognition, inventory valuation and accrued warranty obligations. Actual results could differ from those estimates.

Inventory (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Schedule of inventory

Inventory as of March 31, 2013 and December 31, 2012 consists of the following (in thousands):



	March 31, 2013		December 31, 2012
Raw materials	$	1,964	$	2,223
Finished goods	20,345		17,620
Total inventory	$	22,309	$	19,843

Warranty Obligations (Tables)

3 Months Ended

Mar. 31, 2013

Product Warranties Disclosures [Abstract]

Changes in the Company's product warranty liability

Changes in the Company’s warranty obligations during the three months ended March 31, 2013 and 2012 were as follows (in thousands):



	Three Months Ended March 31,
	2013			2012
Balance, at beginning of period	$	21,338		$	8,738
Warranty expense	3,525			2,109
Settlements	(968		)	(283		)
Balance, at end of period	23,895			10,564
Less current portion included in accrued liabilities	(6,801		)	(2,687		)
Long-term portion	$	17,094		$	7,877

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of financial instruments that are measured at fair value on a recurring basis



	Asset Derivatives				Liability Derivatives
	March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Foreign currency forward contracts (Level 2)	$	150	$	—	$	64	$	268

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2013

Long-term Debt, by Current and Noncurrent [Abstract]

Schedule of long-term debt

The Company’s long-term debt at March 31, 2013 and December 31, 2012 consists of the following (in thousands):



	March 31, 2013			December 31, 2012
Term loans	$	7,400		$	7,400
Equipment financing facility, net of unamortized discount of $78 and $94, respectively	3,086			3,661
Total debt	10,486			11,061
Less current portion	(2,440		)	(2,384		)
Long-term portion	$	8,046		$	8,677

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Topic 835
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-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of summary of stock option activity

The following is a summary of stock option activity for the three months ended March 31, 2013 (in thousands, except per share data):



	Number of Shares Outstanding		Weighted- Average Exercise Price per Share
Options outstanding—December 31, 2012	8,169		$	3.28
Granted	114		4.93
Exercised	(527	)	1.14
Canceled	(73	)	8.06
Options outstanding—March 31, 2013	7,683		3.41

Schedule of restricted stock unit activity

The following is a summary of restricted stock unit activity for the three months ended March 31, 2013 (in thousands, except per share data):



	Restricted Stock Units		Weighted Average Fair Value per Share at Grant Date
Outstanding at December 31, 2012	248		$	5.53
Granted	20		4.92
Vested	(10	)	6.79
Canceled	(3	)	6.90
Outstanding at March 31, 2013	255		5.42

Schedule of components of stock-based compensation expense in the consolidated statement of operations, by report line

The following table summarizes the components of total stock-based compensation expense included in the condensed consolidated statements of operations for the periods presented (in thousands):



	Three Months Ended March 31,
	2013		2012
Cost of revenues	$	108	$	20
Research and development	478		273
Sales and marketing	378		195
General and administrative	471		218
Total	$	1,435	$	706

Schedule of stock-based compensation expense by award type

The following table summarizes stock-based compensation associated with each type of award for the periods presented (in thousands):



	Three Months Ended March 31,
	2013		2012
Stock options and restricted stock units	$	1,285	$	706
Employee Stock Purchase Plan	150		—
Total	$	1,435	$	706

Schedule of valuation assumptions of stock options

The fair value of each option granted during the periods presented was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:



	Three Months Ended March 31,
	2013			2012
Expected term (in years)	4.7			6.0
Expected volatility	73.0		%	70.9		%
Annual risk-free rate of return	0.8		%	1.1		%
Dividend yield	—		%	—		%
Weighted average grant date fair value	$	2.85		$	6.80

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Net Loss Per Share Attributable to Common Stockholders (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Schedule of potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders



	Three Months Ended March 31,
	2013	2012
Stock options to purchase common stock	7,908	6,502
Restricted stock units	247	—
Warrants to purchase common stock	331	132
Warrants to purchase convertible preferred stock	—	187
Convertible preferred stock	—	25,171
Convertible notes	—	3,530
Total	8,486	35,522

Overview and Summary of Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 04, 2012	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012
Basis of Presentation, Consolidation and Related Party Transactions [Line Items]
Common stock, shares issued	10,300,000
Stock issued during period offering price	$ 6.00
Proceeds from the sale of common stock	$ 53.8
Underwriters Discounts and Commissions	3.3
Other estimated offering costs	$ 4.8
Convertible preferred stock, shares outstanding	22,220,856		0	0
Conversion of convertible preferred stock into common stock	25,171,017
Convertible notes, outstanding balance of principal and accrued paid in kind interest	$ 21.2
Conversion of notes into common stock	3,533,988
Conversion price of convertible notes	$ 6.00
KPCB Holdings, Inc. [Member]
Basis of Presentation, Consolidation and Related Party Transactions [Line Items]
Revenue from related parties		$ 2.6

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Schedule of inventory
Raw materials	$ 1,964	$ 2,223
Finished goods	20,345	17,620
Total inventory	$ 22,309	$ 19,843

Warranty Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
Warranty Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Changes in the Company's product warranty liability
Balance, at beginning of period	$ 21,338	$ 8,738
Warranty expense	3,525	2,109
Settlements	(968)	(283)
Balance, at end of period	23,895	10,564
Less current portion	(6,801)	(2,687)
Long-term portion	$ 17,094	$ 7,877	$ 15,260

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Fair Value Measurements (Details) - Fair value, measurements, recurring [Member] - Level 2 [Member] - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Asset Derivatives
Foreign currency forward contracts (Level 2)	$ 150	$ 0
Liability Derivatives
Foreign currency forward contracts (Level 2)	$ 64	$ 268

Fair Value Measurements (Details Textual) - Not designated as hedging instrument [Member] - Foreign exchange forward [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Notional amount of foreign currency derivatives	$ 7,500	$ 6,100
Gain (loss) on foreign currency derivative instruments	$ 86

Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Schedule of long-term debt
Total debt	$ 10,486	$ 11,061
Less current portion	(2,440)	(2,384)
Long-term portion	8,046	8,677
Term loans [Member]
Schedule of long-term debt
Total debt	7,400	7,400
Equipment Financing Facility [Member]
Schedule of long-term debt
Total debt	3,086	3,661
Unamortized discount	$ 78	$ 94

Long-Term Debt (Details Textual) $ in Millions	3 Months Ended
Long-Term Debt (Details Textual) $ in Millions	Mar. 31, 2013 USD ($) debt_agreement
Debt Instrument [Line Items]
Number of debt agreements \| debt_agreement	3
Wells Fargo Bank [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit line facility	$ 50.0
Hercules Technology Growth Capital Inc [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Credit line facility	7.4
Debt instrument additional borrowing amount	15.6
Hercules Technology Growth Capital Inc [Member] \| Equipment Financing Facility [Member]
Debt Instrument [Line Items]
Credit line facility	$ 5.0

Stock-Based Compensation Stock Option Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2013 $ / shares shares
Number of Shares Outstanding
Options outstanding—December 31, 2012 \| shares	8,169
Granted (in shares) \| shares	114
Exercised (in shares) \| shares	(527)
Canceled (in shares) \| shares	(73)
Options outstanding—March 31, 2013 (in shares) \| shares	7,683
Weighted- Average Exercise Price per Share
Options outstanding—December 31, 2012 (in usd per share) \| $ / shares	$ 3.28
Granted (in usd per share) \| $ / shares	4.93
Exercised (in usd per share) \| $ / shares	1.14
Canceled (in usd per share) \| $ / shares	8.06
Options outstanding—March 31, 2013 (in usd per share) \| $ / shares	$ 3.41

Stock-Based Compensation Restricted Stock Unit Activity (Details) - Restricted stock units [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2013 $ / shares shares
Restricted Stock Units
Outstanding at December 31, 2012 (in shares) \| shares	248
Granted (in shares) \| shares	20
Vested (in shares) \| shares	(10)
Canceled (in shares) \| shares	(3)
Outstanding at March 31, 2013 (in shares) \| shares	255
Weighted Average Fair Value per Share at Grant Date
Outstanding at December 31, 2012 (in usd per share) \| $ / shares	$ 5.53
Granted (in usd per share) \| $ / shares	4.92
Vested (in usd per share) \| $ / shares	6.79
Canceled (in usd per share) \| $ / shares	6.90
Outstanding at March 31, 2013 (in usd per share) \| $ / shares	$ 5.42

Stock-Based Compensation Components of Stock-based Compensation Expense by Report Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allocation of Stock-based Compensation Expense Included in the Consolidated Statement of Operations [Abstract]
Total stock-based compensation expense	$ 1,435	$ 706
Cost of revenues [Member]
Allocation of Stock-based Compensation Expense Included in the Consolidated Statement of Operations [Abstract]
Total stock-based compensation expense	108	20
Research and development [Member]
Allocation of Stock-based Compensation Expense Included in the Consolidated Statement of Operations [Abstract]
Total stock-based compensation expense	478	273
Sales and marketing [Member]
Allocation of Stock-based Compensation Expense Included in the Consolidated Statement of Operations [Abstract]
Total stock-based compensation expense	378	195
General and administrative [Member]
Allocation of Stock-based Compensation Expense Included in the Consolidated Statement of Operations [Abstract]
Total stock-based compensation expense	$ 471	$ 218

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock-Based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,435	$ 706
Employee stock options and restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1,285	706
Employee stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 150	$ 0

- Definition

+ References + Details

Stock-Based Compensation Valuation Assumptions of Stock Options Under Black-Scholes Model (Details) - Stock options [Member] - $ / shares	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
The fair value of each option granted during the periods
Expected term (in years)	4 years 8 months 12 days	6 years
Expected volatility	73.00%	70.90%
Annual risk-free rate of return	0.80%	1.10%
Dividend yield	0.00%	0.00%
Weighted average grant date fair value	$ 2.85	$ 6.80

Stock-Based Compensation (Details Textual) $ in Millions	3 Months Ended
Stock-Based Compensation (Details Textual) $ in Millions	Mar. 31, 2013 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total unrecognized compensation cost	$ 12.0
Weighted-average recognition period for unrecognized compensation cost	2 years 7 months 6 days

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Provision for U.S. federal or state income taxes	$ 0
Provision for income tax	$ 182	$ 65

Net Loss Per Share Attributable to Common Stockholders (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	8,486	35,522
Stock options to purchase common stock [Member]
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	7,908	6,502
Restricted stock units [Member]
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	247	0
Warrants to purchase common stock [Member]
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	331	132
Warrants to purchase convertible preferred stock [Member]
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	0	187
Convertible preferred stock [Member]
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	0	25,171
Convertible notes [Member]
The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders
Total	0	3,530

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Loss Per Share Attributable to Common Stockholders (Details Textual) shares in Millions	Apr. 04, 2012 shares
Stock Issuance from Initial Public Offering [Abstract]
Common stock shares issued from the IPO	10.3
Conversion of preferred stock into common stock (in shares)	28.7

- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4, 5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details