Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Other Income (Expense), Net (Detail)

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Summary of Significant Accounting Policies - Schedule of Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Income and Expenses [Abstract]        
Interest income (expense), net $ (1,880) $ 1 $ (4,234) $ 4
Stock warrants issued (5,790)   (5,790)  
Write-off of deferred debt discounts and issuance costs (10,132)   (10,132)  
Gain on fair value change of warrant liability 3,996   7,114  
Other 60 3 82 (31)
Other income (expense), net $ (13,746) $ 4 $ (12,960) $ (27)