Debt - Schedule of Aggregate Advances under the Loan and Security Agreement (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
Aggregate advances under loan and security agreement	$ 3,000,000	$ 1,000,000
Less unamortized discount	(45,947)	(20,208)
Long-term debt, net of debt discount	2,954,053	979,792
Current portion of unamortized discount	23,260
Current portion of long-term debt	(1,465,852)
Long-term debt, net of current portion	$ 1,511,461	$ 979,792