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Consolidated Statement of Redeemable Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Preferred stock, par value	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare		$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, par value	$ 0.0001us-gaap_CommonStockParOrStatedValuePerShare		$ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Stock issuance costs	$ 187us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
IPO [Member]
Stock issuance costs	7,126us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember
Minimum [Member]
Conversion price, per share			$ 14.51us-gaap_TemporaryEquityRedemptionPricePerShare / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Conversion price, per share			$ 39.21us-gaap_TemporaryEquityRedemptionPricePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember
Series D Convertible Preferred Stock [Member]
Issuance/sale of stock, price per share		$ 0.83us-gaap_SharesIssuedPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Stock issuance costs		$ 73us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember

X

- Definition

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



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- Definition

Face amount or stated value per share of common stock.

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-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Amount per share or per unit of equity securities issued by non-development stage entity.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. 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.

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