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Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Warrant liability $ (20,176) $ (40,483)    
Level 3 | Fair Value, Measurements, Recurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Warrant liability (20,176) (40,483) $ (16,783) $ (17,613)
Total liability $ (20,176) $ (40,483)