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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (USD $) In Thousands, except Share data | Total USD ($) | Series B Preferred Stock [Member] | Series C Preferred Stock [Member] | Series D Preferred Stock [Member] | Series E Preferred Stock [Member] | Redeemable convertible preferred stock [Member] USD ($) | Redeemable convertible preferred stock [Member] Series B Preferred Stock [Member] USD ($) | Redeemable convertible preferred stock [Member] Series C Preferred Stock [Member] USD ($) | Redeemable convertible preferred stock [Member] Series D Preferred Stock [Member] USD ($) | Redeemable convertible preferred stock [Member] Series E Preferred Stock [Member] USD ($) | Common Stock [Member] USD ($) | Additional Paid-in Capital [Member] USD ($) | Accumulated Deficit [Member] USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Temporary equity, beginning balance at Dec. 31, 2010 |  |  |  |  |  | $ 30,453 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2010 | (27,786)us-gaap_StockholdersEquity |  |  |  |  |  |  |  |  |  | 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 56 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (27,843)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, beginning balance, shares at Dec. 31, 2010 |  |  |  |  |  | 42,947,474 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Beginning balance, shares at Dec. 31, 2010 |  |  |  |  |  |  |  |  |  |  | 719,957 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of redeemable convertible preferred stock, value |  |  |  |  |  |  | 2,016 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember | 8,053 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |
Issuance of redeemable convertible preferred stock, shares |  |  |  |  |  |  | 2,682,011 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember | 8,923,884 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |
Stock-based compensation expense | 80 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  |  |  | 80 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Accretion of redeemable convertible preferred stock to redemption value | (53)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment |  |  |  |  | 53 us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  | (53)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Net loss | (13,157)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  | (13,157)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, ending balance at Dec. 31, 2011 |  |  |  |  |  | 40,575 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Ending balance at Dec. 31, 2011 | (40,916)us-gaap_StockholdersEquity |  |  |  |  |  |  |  |  |  | 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 83 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (41,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, ending balance, shares at Dec. 31, 2011 |  |  |  |  |  | 54,553,369 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Beginning balance, shares at Dec. 31, 2011 |  |  |  |  |  |  |  |  |  |  | 719,957 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of redeemable convertible preferred stock, value |  |  |  |  |  |  |  | 7,067 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember | 8,990 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |
Issuance of redeemable convertible preferred stock, shares |  |  |  |  |  |  |  | 7,808,400 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember | 6,653,988 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |
Conversion of promissory notes and accrued interest to convertible preferred stock, value |  |  |  |  |  |  |  |  | 6,086 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |
Conversion of promissory notes and accrued interest to convertible preferred stock, shares |  |  |  |  |  |  |  |  | 4,975,260 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |
Issuance of common stock upon exercise of stock options, value | 13 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  |  |  |  |  | 13 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Issuance of common stock upon exercise of stock options, shares | 16,069 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |  |  |  | 16,069 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock-based compensation expense | 121 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  |  |  | 121 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Accretion of redeemable convertible preferred stock to redemption value | (67)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment |  |  |  |  | 67 us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  | (67)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Net loss | (13,880)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  | (13,880)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, ending balance at Dec. 31, 2012 | 62,785 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital |  |  |  |  | 62,785 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Ending balance at Dec. 31, 2012 | (54,729)us-gaap_StockholdersEquity |  |  |  |  |  |  |  |  |  | 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 150 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (54,880)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, ending balance, shares at Dec. 31, 2012 | 73,991,017 us-gaap_TemporaryEquitySharesOutstanding | 40,266,246 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 16,732,284 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 11,629,248 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  | 73,991,017 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  | 736,026 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of redeemable convertible preferred stock, value |  |  |  |  |  |  |  |  | 5,955 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember | 34,844 us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |
Repurchase and retirement of common stock, at cost |  |  |  |  |  |  |  |  |  |  | (6,635)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of redeemable convertible preferred stock, shares |  |  |  |  |  |  |  |  | 4,381,914 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember | 16,110,473 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |
Stock-based compensation expense | 395 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  |  |  | 395 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Accretion of redeemable convertible preferred stock to redemption value | (213)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment |  |  |  |  | 213 us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  | (213)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Net loss | (14,027)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  | (14,027)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, ending balance at Dec. 31, 2013 | 103,797 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital |  |  |  |  | 103,797 us-gaap_TemporaryEquityValueExcludingAdditionalPaidInCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | $ (68,574)us-gaap_StockholdersEquity |  |  |  |  |  |  |  |  |  | $ 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 332 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (68,907)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Temporary equity, ending balance, shares at Dec. 31, 2013 | 94,483,404 us-gaap_TemporaryEquitySharesOutstanding | 40,266,246 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 16,732,284 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 16,011,162 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 16,110,473 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | 94,483,404 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_RedeemableConvertiblePreferredStockMember |  |  |  |  |  |  |
Ending balance, shares at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  | 729,391 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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=27012166&loc=d3e187085-122770 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 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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- Definition Carrying amount of the par value of temporary equity outstanding. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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