Annual report pursuant to Section 13 and 15(d)

Consolidated Financial Statements Details - Schedule of Other Income (Expense), Net (Detail)

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Consolidated Financial Statements Details - Schedule of Other Income (Expense), Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Income And Expenses [Abstract]    
Interest income (expense), net $ 803 $ (4,025)
Stock warrants issued   (5,790)
Write-off of deferred debt discounts and issuance costs   (10,132)
Gain on fair value change of warrant liability 184 7,114
Other (79)  
Other income (expense), net $ 908 $ (12,833)