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Schedule of Fair Value Measurements Using Level 3 Inputs (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Derivative Warrant Liability  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Opening Balance $ 814
Transfers into Level 3 1,884
Included in earnings (3,259)
Purchases, issues, sales and settlements  
Issues 5,670
Settlements (167)
Closing balance 4,942
2017 Notes  
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Opening Balance 25,769
Included in earnings 339
Purchases, issues, sales and settlements  
Settlements (9,616)
Closing balance $ 16,492