Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments and Accrued Interest - Long-term Convertible Note - April 2, 2021 Note (Detail)

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Convertible Instruments and Accrued Interest - Long-term Convertible Note - April 2, 2021 Note (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Nov. 16, 2021
Nov. 02, 2021
Oct. 21, 2021
Oct. 05, 2021
Apr. 02, 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  
Loss on extinguishment of convertible notes               7,963 $ 4,169  
Long-term Convertible Note - April 2, 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          
Conversion of principal and interest of convertible notes to common stock         $ 3,500          
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          
Specified monthly redemption amount         $ 7,500          
Debt instrument prepayment percentage premium         15.00%          
Number of days of notice to be given for prepayment         15 days          
Period in which company was obligated to reduce the outstanding balance of debt         5 months          
Debt proceeds requiring investor consent         $ 50,000          
Additional debt, increase in interest rate         5.00%          
Amortization of issuance discount and costs           400   821    
Unamortized discount and issuance costs           1,600   1,600    
Accrued interest on convertible notes           1,900   1,900    
Interest on convertible notes               1,400    
Net carrying value of note           19,753   $ 19,753   $ 25,715
Monthly redemption amount deferred           7,500        
Loss on extinguishment of convertible notes           $ 3,300        
Long-term Convertible Note - April 2, 2021 Note | Maximum                    
Debt Instrument [Line Items]                    
Convertible notes, interest rate         22.00%          
October 2021 Partitioned Notes Of April 2021 Notes [Member]                    
Debt Instrument [Line Items]                    
Convertible note, aggregate principal     $ 5,000 $ 5,000            
Shares reserved     3.9 3.9            
Specified monthly redemption amount     $ 2,500 $ 2,500            
November 2021 Partitioned Notes Of April 2021 Notes [Member]                    
Debt Instrument [Line Items]                    
Convertible note, aggregate principal $ 4,000 $ 4,000                
Shares reserved 4.2 4.2                
Specified monthly redemption amount $ 3,500 $ 3,500