Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Detail)

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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Warrant liability, Beginning Balance $ 3,002us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Unrealized Gain on warrants (465)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Warrant liability, Ending Balance $ 2,537us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue