Summary of Status of Company's Stock Option Plan (Detail) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Stock Option Plan	Dec. 31, 2013 Stock Option Plan
Shares
Outstanding at beginning of period			2,517,911	3,348,935
Cancelled			0	(58,617)
Exercised			(20,000)	(945,761)
Granted	0	50,000	0	173,354
Outstanding at end of period			2,497,911	2,517,911
Weighted Average Exercise Price
Outstanding at beginning of period			$ 1.33	$ 1.23
Cancelled				$ 1.87
Exercised			$ 1.18	$ 1.20
Granted				$ 2.59
Outstanding at end of period			$ 1.33	$ 1.33