Annual report pursuant to Section 13 and 15(d)

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

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Convertible Instruments and Accrued Interest - Convertible Note - April 23, 2021 Note (Detail)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Apr. 23, 2021
USD ($)
$ / shares
shares
May 31, 2024
USD ($)
agreement
shares
May 31, 2023
USD ($)
Debt Instrument      
Consideration received   $ 1,673  
Aggregate principal amount   $ 30,200 $ 36,450
Convertible Note - April 23, 2021 Note      
Debt Instrument      
Debt instrument term 2 years    
Convertible note, aggregate principal $ 28,500    
Debt instrument, extended term 2 years    
Consideration received $ 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 | $ / shares $ 10.00    
Number Of Days Of Notice To Be Given For Conversion Of Notes Into Common Stock 5 days    
Shares reserved | shares 6.0    
Debt instrument lock in period 6 months    
Number of days of notice to be given for redemption 3 days    
Conversion of principal and interest of convertible notes to common stock $ 7,000    
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%    
Beneficial conversion feature $ 0    
Number of exchange agreements | agreement   4  
Conversion of Series C preferred stock to common stock (in shares) | shares   13.9  
Aggregate principal amount   $ 27,369 29,369
Loss on induced conversion   1,900 $ 0
Partitioned Notes, April 23, 2021      
Debt Instrument      
Convertible note, aggregate principal   $ 2,000  
Maximum | Convertible Note - April 23, 2021 Note      
Debt Instrument      
Convertible notes, interest rate 22.00%