Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Long-term Convertible Note - January 2019 Note (Detail)

v3.21.2
Convertible Instruments - Long-term Convertible Note - January 2019 Note (Detail) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Jan. 30, 2019
May 31, 2021
May 31, 2020
May 31, 2019
Mar. 13, 2020
Aug. 31, 2019
Debt Instrument [Line Items]            
Net Proceeds   $ 100,000,000 $ 15,000,000 $ 14,877,000    
Common stock warrants to purchase shares         0.3 2.6
Exercise price of warrants, per share         $ 1.00 $ 0.50
Term of warrants         5 years 5 years
Convertible note, redeemed amount   $ 77,703,000 15,092,000 1,680,000    
Debt instrument converted number of shares issued   19.9        
Maximum            
Debt Instrument [Line Items]            
Exercise price of warrants, per share   $ 1.35        
Long-term Convertible Note-January 2019 Note            
Debt Instrument [Line Items]            
Debt instrument term 2 years          
Convertible note, aggregate principal $ 5,700,000          
Net Proceeds 5,000,000          
Unamortized discount 600,000          
Conversion of principal and interest of convertible notes to common stock $ 100,000          
Convertible notes, interest rate 10.00%          
Conversion price per share $ 0.50          
Debt instrument lock in period 6 months          
Number of days of notice to be given for conversion of notes into common stock 5 days          
Number of days of notice to be given for redemption 5 days          
Days prior to conversion 20 days          
Stock price multiplier 0.85%          
Shares reserved 20.0          
Common stock warrants to purchase shares 5.0          
Exercise price of warrants, per share $ 0.30          
Term of warrants 5 years          
Fair value of redemption provision $ 1,465,000          
Relative fair value of equity classified warrants 858,000          
Beneficial conversion feature 2,677,000          
Interest expense     6,100,000 $ 100,000    
Accretion of remaining unamortized discount     5,800,000      
Convertible note, redeemed amount     $ 6,300,000      
Debt instrument converted number of shares issued     10.8      
Cash paid to redeem debt     $ 850,000      
Carrying value of Note     $ 0      
Long-term Convertible Note-January 2019 Note | Maximum            
Debt Instrument [Line Items]            
Specified monthly redemption amount $ 350,000