Stockholders Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Aug. 04, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders Equity Note [Abstract]
Common stock reserved for future grants of stock options		2,240,103
Common stock reserved for issuance upon exercise of outstanding common stock options		1,972,011
Common stock reserved for future exercise of outstanding warrants		267,826
Outstanding warrants to purchase common stock		267,826	267,826
Outstanding warrants to purchase common stock at exercise price per share		$ 3.65	$ 3.65
Warrants exercisable date of issuance		10 years
Outstanding warrants to purchase common stock				13,735
Outstanding warrants to purchase common stock at exercise price per unit				7.28
Issuance of shares of common stock to warrant holder			2,188
Stock repurchase program, authorized amount	$ 25.0
Stock repurchase program, period	2 years
Repurchase of company shares		0	0