Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares authorized	5,000,000us-gaap_TemporaryEquitySharesAuthorized	135,816,462us-gaap_TemporaryEquitySharesAuthorized
Convertible preferred stock, shares issued	0us-gaap_TemporaryEquitySharesIssued	120,648,174us-gaap_TemporaryEquitySharesIssued
Convertible preferred stock, shares outstanding	0	120,648,174
Convertible preferred stock, liquidation preference	$ 0	$ 60,392
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000us-gaap_CommonStockSharesAuthorized	15,652,174us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	24,245,437us-gaap_CommonStockSharesIssued	1,257,311us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	24,245,437us-gaap_CommonStockSharesOutstanding	1,257,311us-gaap_CommonStockSharesOutstanding

Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. 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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Per share amount of par value or stated value of stock classified as temporary equity. 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.

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