Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Detail)

v3.21.1
Subsequent Events (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Apr. 02, 2021
Mar. 18, 2021
Mar. 12, 2021
Mar. 03, 2021
Jan. 28, 2021
Dec. 08, 2020
Dec. 04, 2020
Jul. 29, 2020
Apr. 30, 2021
Mar. 31, 2021
Feb. 28, 2021
Nov. 30, 2020
Feb. 28, 2021
Feb. 29, 2020
Nov. 17, 2020
Oct. 26, 2020
May 31, 2020
Nov. 30, 2019
Aug. 31, 2019
Subsequent Event [Line Items]                                      
Debt instrument converted into equity value                         $ 29,800 $ 10,976          
Debt instrument converted number of shares issued                         8,300            
Common stock par or stated value per share         $ 0.001 $ 0.001 $ 0.001       $ 0.001 $ 0.001 $ 0.001   $ 0.001   $ 0.001    
Stock price, in dollars per share                       $ 1.50   $ 0.50       $ 0.50 $ 0.50
Conversion price                                   $ 0.50  
Private Warrant Exchange [Member]                                      
Subsequent Event [Line Items]                                      
Stock price, in dollars per share           0.24 0.36                 $ 0.24      
Class of warrants, exercise price           $ 0.30 $ 0.45                        
Stock issued during the period new issues         3,600 2,000 300       5,900 29,000              
Warrants Exchanged         2,500 1,900 300       4,700 27,900              
Proceeds from issuance of common stock         $ 2,900 $ 400 $ 100         $ 12,400              
Private Warrant Exchange [Member] | Maximum                                      
Subsequent Event [Line Items]                                      
Stock price, in dollars per share         $ 0.75             $ 1.08              
Class of warrants, exercise price         1.50             1.35              
Private Warrant Exchange [Member] | Minimum                                      
Subsequent Event [Line Items]                                      
Stock price, in dollars per share         0.45             0.21              
Class of warrants, exercise price         $ 0.90             $ 0.30              
Long Term Convertible Note Issued July 2020                                      
Subsequent Event [Line Items]                                      
Repayments of Notes Payable                     $ 7,500                
Outstanding balance of convertible note including accrued unpaid interest                     $ 22,700   $ 22,700            
Debt Instrument, Term               2 years                      
Debt Instrument, Face Amount               $ 28,500                      
Convertible notes, interest rate               10.00%                      
Conversion price               $ 10.00                      
Unamortized discount               $ 3,400                      
Proceeds From Issuance Of Convertible Promissory Notes               $ 25,000                      
Subsequent Event                                      
Subsequent Event [Line Items]                                      
Common stock par or stated value per share $ 0.001 $ 0.001 $ 0.001           $ 0.001 $ 0.001                  
Aggregate initial offering price       $ 200,000                              
Number of shares underlying warrants       13,600                              
Subsequent Event | Private Warrant Exchange [Member]                                      
Subsequent Event [Line Items]                                      
Shares issued, excluding inducement shares 800 900                                  
Shares issued, as an added inducement 300 400                                  
Stock issued during the period new issues 1,100 1,300                                  
Proceeds from issuance of common stock $ 700 $ 800                                  
Subsequent Event | Private Warrant Exchange [Member] | Maximum                                      
Subsequent Event [Line Items]                                      
Stock price, in dollars per share   $ 0.90                                  
Class of warrants, exercise price   0.45                                  
Subsequent Event | Private Warrant Exchange [Member] | Minimum                                      
Subsequent Event [Line Items]                                      
Stock price, in dollars per share $ 0.90 0.60                                  
Class of warrants, exercise price $ 0.45 $ 0.30                                  
Subsequent Event | Exercise Of Warrants And Options, Combined [Member]                                      
Subsequent Event [Line Items]                                      
Stock issued during the period new issues                   100                  
Warrants Exchanged                   100                  
Proceeds from issuance of common stock                   $ 100                  
Subsequent Event | Exercise Of Warrants And Options, Combined [Member] | Maximum                                      
Subsequent Event [Line Items]                                      
Class of warrants, exercise price                   $ 1.35                  
Subsequent Event | Exercise Of Warrants And Options, Combined [Member] | Minimum                                      
Subsequent Event [Line Items]                                      
Class of warrants, exercise price                   $ 0.75                  
Subsequent Event | Long Term Convertible Note Issued July 2020                                      
Subsequent Event [Line Items]                                      
Debt Instrument, Periodic Payment     $ 7,500           $ 7,500                    
Debt instrument converted into equity value     $ 7,500           $ 7,500                    
Debt instrument converted number of shares issued     3,600           2,500                    
Outstanding balance of convertible note including accrued unpaid interest     $ 15,200           $ 7,900                    
Subsequent Event | April 2021 Long Term Convertible Note [Member]                                      
Subsequent Event [Line Items]                                      
Debt Instrument, Term 2 years                                    
Debt Instrument, Face Amount $ 28,500                                    
Convertible notes, interest rate 10.00%                                    
Conversion price $ 10.00                                    
Unamortized discount $ 3,400                                    
Long-term Debt 25,000                                    
Unamortized Debt Issuance Expense $ 100