Formation and Business of the Company - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	67 Months Ended			1 Months Ended
Jun. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 IPO [Member]
Initial Public Offering [Line Items]
Business incorporated date	Dec. 10, 2008
Initial public offering shares of common stock issued					6,900,000
Net proceeds after underwriting discounts, commissions and offering expenses	$ 132,095	$ 132,095			$ 132,100
Common stock, shares authorized	50,000,000	50,000,000	50,000,000	15,652,174
Convertible preferred stock, shares authorized	5,000,000	5,000,000	5,000,000	135,816,462

- Definition

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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