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Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
May 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Warrant liability $ (40,483) $ (17,613) $ (17,600) $ (36,600)
Level 3 | Fair Value, Measurements, Recurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Warrant liability (40,483) (17,613) $ (46,313)  
Total liability $ (40,483) $ (17,613)