Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.20.4
Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 18, 2020
Dec. 14, 2020
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Jul. 27, 2020
May 31, 2020
Subsequent Event [Line Items]                  
Class of warrants, exercise price         $ 0.45   $ 0.45    
Proceeds from stock options exercised           $ 48      
Common stock par or stated value per share       $ 0.001   $ 0.001     $ 0.001
Outstanding balance of convertible note including accrued unpaid interest               $ 9,500  
Debt instrument converted into equity value           $ 4,500      
Non-cash interest expense       $ 6,294 $ 2,944 11,454 $ 7,102    
November 2020 Long Term Convertible Notes [Member]                  
Subsequent Event [Line Items]                  
Outstanding balance of convertible note including accrued unpaid interest       $ 28,600   $ 28,600      
Subsequent Event                  
Subsequent Event [Line Items]                  
Stock options with an exercise prices maximum $ 1.40                
Stock options with an exercise prices minimum $ 0.30                
Common stock par or stated value per share     $ 0.001            
Non-cash interest expense     $ 600            
Subsequent Event | Excercise Of Warrants And Options [Member]                  
Subsequent Event [Line Items]                  
Proceeds from stock options exercised $ 2,600                
Stock issued during the period new issues 3.7                
Subsequent Event | 2020 Note [Member]                  
Subsequent Event [Line Items]                  
Outstanding balance of convertible note including accrued unpaid interest   $ 21,300              
Subsequent Event | November 2020 Long Term Convertible Notes [Member] | Partitioned Notes [Member]                  
Subsequent Event [Line Items]                  
Common stock par or stated value per share   $ 0.001              
Debt instrument converted into equity value   $ 7,500              
Debt instrument converted number of shares issued   2.2              
Debt instrument prepayment amout payable   $ 7,500              
Subsequent Event | Maximum [Member]                  
Subsequent Event [Line Items]                  
Class of warrants, exercise price     $ 0.45            
Purchase price, per share     0.36            
Subsequent Event | Minimum [Member]                  
Subsequent Event [Line Items]                  
Class of warrants, exercise price     0.30            
Purchase price, per share     $ 0.24            
Subsequent Event | Private Warrant Exchange [Member]                  
Subsequent Event [Line Items]                  
Common stock par or stated value per share   $ 0.001              
Stock issued during the period new issues   2.4              
Subsequent Event | Private Warrant Exchange [Member] | Inducement To Excercise Warrants [Member]                  
Subsequent Event [Line Items]                  
Stock issued during the period new issues   0.2              
Subsequent Event | Private Warrant Exchange [Member] | November 2020 Long Term Convertible Notes [Member]                  
Subsequent Event [Line Items]                  
Stock issued during the period new issues   2.2              
Subsequent Event | Warrants                  
Subsequent Event [Line Items]                  
Stock issued during the period new issues 3.7