Annual report pursuant to Section 13 and 15(d)

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

v3.21.2
Convertible Instruments - Long-term Convertible Note - April 23, 2021 Note (Detail) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Apr. 23, 2021
May 31, 2021
May 31, 2020
May 31, 2019
Debt Instrument [Line Items]        
Net Proceeds   $ 100,000,000 $ 15,000,000 $ 14,877,000
Accrued interest on convertible notes   2,007,000 292,000  
Interest on convertible notes   4,387,000 $ 7,330,000 $ 950,000
Long-term Convertible Note - April 23, 2021 Note        
Debt Instrument [Line Items]        
Debt instrument term 2 years      
Convertible note, aggregate principal $ 28,500,000      
Net Proceeds 25,000,000.0 25,000,000    
Unamortized discount 3,400,000      
Conversion of principal and interest of convertible notes to common stock $ 100,000      
Convertible notes, interest rate 10.00%      
Threshold percentage of default interest rate 22.00%      
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 $ 75,000,000.0      
Additional debt, increase in interest rate 5.00%      
Beneficial conversion feature $ 0      
Amortization of issuance discount and costs   182,000    
Unamortized discount and issuance costs   3,300,000    
Accrued interest on convertible notes   300,000    
Interest on convertible notes   302,000    
Net carrying value of note   $ 25,500,000    
Maximum | Long-term Convertible Note - April 23, 2021 Note        
Debt Instrument [Line Items]        
Specified monthly redemption amount $ 7,000,000.0