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Derivative Liabilities - Fair value (Detail) - USD ($)
shares in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 33 Months Ended
Sep. 30, 2016
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
May 31, 2020
May 31, 2019
Sep. 15, 2016
Derivative [Line Items]                
Fundamental transaction, percentage ownership 50.00%              
Change in fair value of derivative liability     $ (2,934,000)   $ (2,105,000)      
Warrant Derivative Liability                
Derivative [Line Items]                
Number of shares indexed             7,733 7,733
Number of shares redeemed           7,733    
Derivative liability             $ 402,000 $ 5,179,000
Change in fair value of derivative liability   $ 0 $ (4,100,000) $ 0 $ (4,100,000) $ 11,547,000 $ (4,777,000)  
Fair value of warrants exercised           $ (11,949,000)