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Fair Value Measurement - Reconciliation of Derivative Liability Activity (Detail) - Derivative Financial Instruments, Liabilities [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2015
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Opening balance - December 31, 2014 $ 11
Purchases, sales, issuances, and settlements 0
Transfers into and (or) out of Level 3 0
Change in fair value $ (11)
Closing balance - March 31, 2015