Stockholders' Equity - Summary of Activity Related to Options Granted (Detail) (USD $)	1 Months Ended			12 Months Ended
	Dec. 31, 2012	Aug. 30, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of stock options outstanding, beginning balance				3,640,324	2,674,324
Number of stock options granted	9,900	30,000	150,000	446,000	1,014,000
Number of stock options exercised				(30,500)
Number of stock options forfeited				(10,500)	(33,000)
Number of stock options expired					(15,000)
Number of stock options outstanding, ending balance	3,640,324			4,045,324	3,640,324
Number of stock options exercisable				3,460,992
Weighted average exercise price, options outstanding, beginning balance				$ 1.76	$ 1.59
Number of stock options unvested ending balance				584,332
Weighted average exercise price, options granted				$ 2.61	$ 2.30
Weighted average exercise price, options exercised				$ 2.67
Weighted average exercise price, options forfeited				$ 2.35	$ 2.47
Weighted average exercise price, options expired					$ 2.68
Weighted average exercise price, options outstanding, ending balance	$ 1.76			$ 1.85	$ 1.76
Weighted average remaining contractual term, options outstanding, beginning balance				2 years 8 months 9 days	2 years 5 months 5 days
Weighted average exercise price, options exercisable				$ 1.75
Weighted average remaining contractual term, options outstanding, ending balance	2 years 8 months 9 days				2 years 8 months 9 days
Weighted average remaining contractual term, exercisable options, ending Balance				2 years 3 months 22 days
Aggregate fair value, beginning balance				$ 6,406,970	$ 4,252,175
Aggregate fair value, ending balance	6,406,970			7,483,849	6,406,970
Aggregate fair value, exercisable				$ 6,056,736