Fair Value of Financial Instruments - Schedule of Derivative Warrant Liabilities (Detail) (Significant Unobservable Inputs (Level 3) [Member], Warrants Derivative Liabilities [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Significant Unobservable Inputs (Level 3) [Member] | Warrants Derivative Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance at January 1, 2014	$ 3,017,142
Issuance of warrants with derivative liabilities	5,584,865
Changes in estimated fair value	(137,142)
Ending balance at March 31, 2014	$ 8,464,865