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Derivative Financial Instruments - Reconciliation of Beginning and Ending Balances of Assets and Liabilities Measured at Fair Value Using Significant Observable Inputs (Detail) (Midcap warrant [Member], Level 2 [Member], USD $)	6 Months Ended
	Jun. 30, 2014
Midcap warrant [Member] \| Level 2 [Member]
Fair Value Measurement Inputs Disclosure [Line Items]
Warrant liability, Beginning balance	$ 4,315,183
Decrease due to exercise of warrants	(2,499,273)
Increase in fair value of warrants	8,945,782
Warrant liability, Ending balance	$ 10,761,692
Warrant liability, Beginning balance, Number of warrants	1,999,436
Decrease due to exercise of warrants, Number of warrants	(798,871)
Increase in fair value of warrants, number of warrants
Warrant liability, Ending balance, Number of warrants	1,200,565

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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