Debt - Schedule of Maturities of Long-Term Debt (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Maturities Of Long Term Debt [Abstract]
2015	$ 436,375
2016	2,433,505
2017	2,119,935
Total minimum payments	4,989,815
Less amounts representing interest	(489,815)
Gross balance of outstanding debt	4,500,000
Less debt discount	(108,122)	[1]
Total carrying value	4,391,878
Less current portion	(150,430)		(1,442,592)
Long-term debt, net of current portion	$ 4,241,448		$ 1,511,461

[1] Represents the initial fair value of the detachable warrants to purchase common stock issued in connection with the term debt, net of amortization.