Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Long-term Convertible Note - November 2020 Note (Detail)

v3.21.2
Convertible Instruments - Long-term Convertible Note - November 2020 Note (Detail)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 27, 2021
USD ($)
shares
Nov. 10, 2020
USD ($)
$ / shares
shares
Jul. 29, 2020
USD ($)
$ / shares
shares
Jul. 31, 2021
USD ($)
shares
Jun. 30, 2021
USD ($)
shares
Nov. 30, 2020
USD ($)
May 31, 2021
USD ($)
agreement
item
shares
May 31, 2020
USD ($)
May 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Net Proceeds             $ 100,000,000 $ 15,000,000 $ 14,877,000
Shares issued on debt conversion | shares             19.9    
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 - November 2020 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 | $ / 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              
Specified monthly redemption amount   $ 7,500,000       $ 7,500,000      
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              
Period in which company was obligated to reduce the outstanding balance of debt   5 months              
Threshold percentage of cash flow test   10.00%              
Debt proceeds requiring investor consent   $ 25,000,000.0              
Additional debt, increase in interest rate   5.00%              
Number of exchange agreements | agreement             2    
Number of partitioned notes | item             2    
Loss on extinguishment of convertible notes             $ 6,400,000    
Beneficial conversion feature   $ 0              
Amortization inclusive of debt repayments             2,300,000    
Unamortized discount and issuance costs             1,200,000    
Accrued interest on convertible notes             1,300,000    
Interest on convertible notes             1,258,000    
Net carrying value of note             13,600,000    
Long-term Convertible Note - November 2020 Note | Subsequent Event                  
Debt Instrument [Line Items]                  
Monthly redemption amount deferred $ 3,500,000     $ 3,500,000 $ 1,500,000        
Net carrying value of note 4,500,000       7,900,000        
Long-term Convertible Note - November 2020 Note | Maximum                  
Debt Instrument [Line Items]                  
Specified monthly redemption amount   $ 3,500,000              
December 2020 Partitioned Note                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal             $ 7,500,000    
Shares issued on debt conversion | shares             2.2    
May 2021 Partitioned Notes                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal             $ 7,500,000    
Shares issued on debt conversion | shares             4.2    
June 2021 Partitioned Notes [Member] | Subsequent Event                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal         $ 6,000,000.0        
Shares issued on debt conversion | shares         4.2        
July 2021 Partitioned Notes [Member] | Subsequent Event                  
Debt Instrument [Line Items]                  
Convertible note, aggregate principal $ 4,000,000.0     $ 4,000,000.0          
Shares issued on debt conversion | shares 3.3     3.3          
Long-term Convertible Note-July 2020 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%            
Conversion price per share | $ / shares     $ 10.00            
Number of days of notice to be given for conversion of notes into common stock     5 days            
Debt instrument lock in period     6 months            
Number of days of notice to be given for redemption     3 days            
Shares issued on debt conversion | shares     11.3            
Loss on extinguishment of convertible notes             9,300,000    
Beneficial conversion feature     $ 0            
Amortization inclusive of debt repayments             3,500,000    
Interest on convertible notes             1,901,000    
Net carrying value of note             $ 0    
Long-term Convertible Note-July 2020 Note | Maximum                  
Debt Instrument [Line Items]                  
Specified monthly redemption amount     $ 1,600,000