Summary of Status of Company's Stock Option Plan (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Shares
Granted	173,354	30,843
Weighted Average Exercise Price
Granted	$ 2.59
Stock Option Plan
Shares
Outstanding at beginning of period	3,348,935	3,435,443
Cancelled	(58,617)	(8,313)
Exercised	(945,761)	(109,038)
Granted	173,354	30,843
Outstanding at end of period	2,517,911	3,348,935
Weighted Average Exercise Price
Outstanding at beginning of period	$ 1.23	$ 1.22
Cancelled	$ 1.87	$ 1.10
Exercised	$ 1.20	$ 1.42
Granted	$ 2.59	$ 3.27
Outstanding at end of period	$ 1.33	$ 1.23