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Reconciliation of Financial Instruments Recognized at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Balance of embedded conversion derivative liability $ 760us-gaap_DerivativeLiabilities
Gain on fair value adjustments to embedded conversion derivative liability (98)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Balance of embedded conversion derivative liability $ 662us-gaap_DerivativeLiabilities