Stockholders' Deficit - Summary of Activity Related to Options Granted (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock options outstanding, beginning balance	2,137,000
Number of stock options granted	200,000
Number of stock options exercised	0
Number of stock options forfeited	(169,000)
Number of stock options expired	0
Number of stock options outstanding, ending balance	2,168,000	2,137,000
Number of stock options exercisable	1,861,916
Number of stock options unvested ending balance	306,084
Weighted average exercise price, options outstanding, beginning balance	$ 2.53
Weighted average exercise price, options granted	0.60
Weighted average exercise price, options exercised	0
Weighted average exercise price, options forfeited	1.69
Weighted average exercise price, options expired	0
Weighted average exercise price, options outstanding, ending balance	2.33	$ 2.53
Weighted average exercise price, options exercisable	$ 2.45
Weighted average remaining contractual term, options outstanding	1 year 11 months 9 days	9 months
Aggregate fair value, beginning balance	$ 5,051,440	$ 5,406,610
Aggregate fair value, exercisable	$ 4,561,694