Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments and Accrued Interest - Long-term Convertible Note - April 23, 2021 Note (Detail)

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Convertible Instruments and Accrued Interest - Long-term Convertible Note - April 23, 2021 Note (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Apr. 23, 2021
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
May 31, 2021
Debt Instrument [Line Items]            
Net Proceeds         $ 50,000  
Accrued interest on convertible notes   $ 3,670   $ 3,670   $ 2,007
Interest on convertible notes   1,426 $ 1,047 3,112 $ 1,613  
Long-term Convertible Note - April 23, 2021 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%          
Percentage increase in amount payable on default 15.00%          
Percentage increase in amount payable, second scenario 10.00%          
Percentage increase in amount payable, third default scenario 5.00%          
Conversion price per share $ 10.00          
Number of days of notice to be given for conversion of notes into common stock 5 days          
Shares reserved 6.0          
Debt instrument lock in period 6 months          
Number of days of notice to be given for redemption 3 days          
Threshold trading days to satisfy redemption obligation 3 days          
Debt instrument prepayment percentage premium 15.00%          
Number of days of notice to be given for prepayment 15 days          
Debt proceeds requiring investor consent $ 75,000          
Additional debt, increase in interest rate 5.00%          
Amortization of issuance discount and costs   400   877    
Unamortized discount and issuance costs   2,400   2,400    
Accrued interest on convertible notes   1,800   1,800    
Interest on convertible notes       1,500    
Net carrying value of note   $ 27,864   $ 27,864   $ 25,485
Maximum | Long-term Convertible Note - April 23, 2021 Note            
Debt Instrument [Line Items]            
Conversion of principal and interest of convertible notes to common stock $ 7,000          
Threshold percentage of default interest rate 22.00%