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Fair Value Measurement - Roll Forward for Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Outstanding Warrants [Member]	Jun. 30, 2014 Loan Payable [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at December 31, 2013		$ 5,541,809	$ 12,909,244
Add loan proceeds			3,820,264
Less fair value of warrants exercised		(997,237)
Add amortization of discount			110,401
Add change in fair value of warrants		3,981,094
Less repayments of principal	(956,035)		(1,900,374)
Balance at June 30, 2014		8,525,666	14,939,535
Current portion			3,832,630
Non-current portion			$ 11,106,905

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the total principal payments made during the annual reporting period.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Cash received from principal payments made on loans related to operating activities.

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