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Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Warrant liability $ (8,344) $ (17,613)    
Level 3 | Fair Value, Measurements, Recurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Warrant liability (8,344) (17,613) $ (50,207) $ (46,313)
Total liability $ (8,344) $ (17,613)