Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments and Accrued Interest - Long-term Convertible Note - November 2020 Note (Detail)

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Convertible Instruments and Accrued Interest - Long-term Convertible Note - November 2020 Note (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 10, 2020
Aug. 31, 2021
Jul. 31, 2021
Jun. 30, 2021
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
May 31, 2021
Debt Instrument [Line Items]                  
Net Proceeds               $ 50,000  
Amortization of issuance discount and costs             $ 2,452    
Accrued interest on convertible notes         $ 4,857   4,857   $ 2,007
Interest on convertible notes         1,187 $ 1,257 4,299 2,870  
Long-term Convertible Note - November 2020 Note                  
Debt Instrument [Line Items]                  
Debt instrument term 2 years                
Convertible note, aggregate principal $ 28,500                
Net Proceeds 25,000                
Unamortized discount 3,400                
Debt issuance costs $ 100                
Convertible notes, interest rate 10.00%                
Conversion price per share $ 10.00                
Number of days of notice to be given for conversion of notes into common stock 5 days                
Loss on extinguishment of convertible notes         0 $ 0 4,700 $ 4,400  
Amortization of issuance discount and costs         0   98    
Interest on convertible notes         $ 0   $ 200    
June 2021 Partitioned Notes                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal       $ 6,000          
Shares issued on debt conversion       4.2          
Monthly redemption amount deferred       $ 1,500          
July 2021 Partitioned Notes                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal     $ 4,000            
Shares reserved     3.3            
Monthly redemption amount deferred     $ 3,500            
August 2021 Partitioned Notes                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal   $ 4,900              
Shares reserved   4.4              
Monthly redemption amount deferred   $ 2,600