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 9 Months Ended
Apr. 23, 2021
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Mar. 31, 2022
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    
Net carrying value of note   $ 40,504   $ 40,504     64,754
Indemnitors              
Debt Instrument [Line Items]              
Warrants to purchase common shares, shares   30.0   30.0   13.0  
Private Equity Offering              
Debt Instrument [Line Items]              
Warrants to purchase common shares, shares   7.3   7.3      
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   $ 1,309      
Unamortized discount and issuance costs   2,000   2,000      
Accrued interest on convertible notes   2,600   2,600      
Interest on convertible notes       2,300      
Net carrying value of note   $ 29,062   $ 29,062     $ 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            
Convertible notes, interest rate 22.00%