Stockholders' Equity (Deficit) and Redeemable Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Equity [Abstract]
Common stock, shares authorized	100,000,000	27,200,862
Common stock, shares issued	31,839,087	16,183,901
Common stock, shares outstanding	31,839,087	16,183,901
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Preferred stock, par value	$ 0.01	$ 0.01