Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Pro Forma	Mar. 31, 2014 Redeemable convertible Series A preferred stock	Dec. 31, 2013 Redeemable convertible Series A preferred stock	Mar. 31, 2014 Redeemable convertible Series A preferred stock Pro Forma	Mar. 31, 2014 Redeemable convertible Series B preferred stock	Dec. 31, 2013 Redeemable convertible Series B preferred stock	Mar. 31, 2014 Redeemable convertible Series B preferred stock Pro Forma	Mar. 31, 2014 Redeemable convertible Series C preferred stock	Dec. 31, 2013 Redeemable convertible Series C preferred stock	Mar. 31, 2014 Redeemable convertible Series C preferred stock Pro Forma	Mar. 31, 2014 Redeemable convertible Series D preferred stock	Dec. 31, 2013 Redeemable convertible Series D preferred stock	Mar. 31, 2014 Redeemable convertible Series D preferred stock Pro Forma
Redeemable convertible preferred stock, par value (in dollars per share)				$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Redeemable convertible preferred stock, shares authorized				10,033,976	10,033,976	10,033,976	5,057,901	5,057,901	5,057,901	4,429,601	4,429,601	4,429,601	4,069,352	4,069,352	4,069,352
Redeemable convertible preferred stock, shares issued				10,033,976	10,033,976	0	5,057,901	5,057,901	0	4,429,601	4,429,601	0	3,979,730	3,979,730	0
Redeemable convertible preferred stock, shares outstanding				10,033,976	10,033,976	0	5,057,901	5,057,901	0	4,429,601	4,429,601	0	3,979,730	3,979,730	0
Redeemable convertible preferred stock, liquidation preference (in dollars)				$ 12,732			$ 22,564			$ 32,519			$ 31,100
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	60,000,000	60,000,000	60,000,000
Common stock, shares issued	7,769,589	7,629,133	39,897,174
Common stock, shares outstanding	7,769,589	7,629,133	39,897,174

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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The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. 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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- Definition

The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and 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.

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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.

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