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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Debt Instrument Fair Value Carrying Value [Abstract]
Expense (income) recognized on adjustment of fair value of stock warrant liability	$ 0us-gaap_FairValueAdjustmentOfWarrants	$ (309,000)us-gaap_FairValueAdjustmentOfWarrants
Derivative liability, fair value, gross liability	$ 0

Fair value, before 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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