Net (Loss) Income Per Share - Computation of Denominators Used in Net (Loss) Income Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic:
Weighted average common shares outstanding	22,608,324	4,288,243	19,150,412	3,975,463
Diluted:
Weighted average common shares outstanding	22,608,324	4,288,243	19,150,412	3,975,463
Convertible preferred stock		11,245,907		11,255,016
Common stock options		438,299		438,299
Common stock warrants	0	0	0	0
Convertible promissory notes (as if converted)	0	0	0	0
Denominator for diluted net (loss) income per share available to common stockholders	22,608,324	15,972,449	19,150,412	15,668,778