Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Details)

v3.22.2
Stockholders' Equity - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Jan. 26, 2022
Oct. 22, 2021
Aug. 13, 2021
Jun. 05, 2020
Jun. 04, 2020
May 31, 2022
Sep. 30, 2021
May 31, 2021
May 31, 2022
May 31, 2021
Nov. 30, 2020
May 31, 2022
May 31, 2021
Aug. 31, 2021
Jun. 04, 2021
May 17, 2021
Jan. 31, 2020
Sep. 30, 2016
Class of Warrant or Right [Line Items]                                    
Preferred stock, par or stated value per share (in dollars per share)           $ 0.0001     $ 0.0001     $ 0.0001   $ 0.0001       $ 0.0001
Convertible preferred stock, shares issued upon conversion (in shares)                                   1
Stock options exercised (in shares)                       0            
Share-based compensation arrangement by share-based payment award, options, forfeitures in period (in shares)                       366,270            
Preferred options outstanding (in shares)           1,549,845     1,549,845     1,549,845   1,776,115        
Share-based compensation arrangement by share-based payment award, expiration period                       10 years            
Proceeds from issuance of common stock                       $ 0 $ 10,701,000          
Common stock, par or stated value per share (in dollars per share)           $ 0.0001     $ 0.0001     $ 0.0001   $ 0.0001 $ 0.0001      
Warrants exercised (in shares)                       9,621,964            
Payments of stock issuance costs                       $ 3,663,000 611,000          
Change in fair value due to warrants modification                       13,728,000 0          
Adjustments to additional paid in capital, warrant issued                       6,861,000            
Additional paid-in capital           $ 146,877,000     $ 146,877,000     146,877,000   $ 142,786,000        
Deemed dividend from change in fair value from warrants modification                 $ 0 $ 0   $ 7,731,000 $ 0          
Class of warrant or right, outstanding (in shares)           22,440,225     22,440,225     22,440,225   9,592,085        
September 2021 Private Placement Exercised Prefunded Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)           $ 0.0001     $ 0.0001     $ 0.0001            
Proceeds from issuance of common stock           $ 467                        
Existing Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)                               $ 2.425    
Warrants to acquire shares of common stock (in shares)                               4,948,453    
Common stock, par or stated value per share (in dollars per share)                               $ 0.0001    
Change in fair value due to warrants modification $ 639,000                                  
Investor Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share) $ 1.20                                  
Warrants exercised (in shares) 4,948,453                                  
Jan 2022 Common Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share) $ 1.55                                  
Warrants to acquire shares of common stock (in shares) 9,896,906                                  
Proceeds from issuance of warrants $ 5,900,000                                  
Payments of stock issuance costs 461,000                                  
Change in fair value due to warrants modification 12,590,000                                  
Adjustments to additional paid in capital, warrant issued 5,477,000                                  
Additional paid-in capital 5,500,000                                  
Deemed dividend from change in fair value from warrants modification $ 7,731,000                                  
Sep 2021 Underwriter Warrants                                    
Class of Warrant or Right [Line Items]                                    
Warrants term           4 years     4 years     4 years            
Warrants and rights outstanding, requisite exercise period           6 months     6 months     6 months            
Chief Executive Officer | Scott W Absher                                    
Class of Warrant or Right [Line Items]                                    
Preferred stock, par or stated value per share (in dollars per share)     $ 0.0001                              
Share-based compensation arrangement by share-based payment award, fair value assumptions, exercise price (in dollars per share)     $ 0.0001                             $ 0.0001
Share-based compensation arrangement by share-based payment award, expiration period     24 months                              
Share-based compensation arrangement by share-based payment award, assets or earning power threshold for option exercise     50.00%                              
Convertible preferred stock, shares issuable upon conversion per preferred share (in shares)     1                              
Preferred Stock Issued                                    
Class of Warrant or Right [Line Items]                                    
Stock options exercised (in shares)                     294,490              
Preferred options outstanding (in shares)           37,570     37,570     37,570            
Common stock issued for convertible securities (in shares)                         (12,500)          
Preferred Stock Issued | Chief Executive Officer | Scott W Absher                                    
Class of Warrant or Right [Line Items]                                    
Stock options exercised (in shares)         12,500,000                          
Number of options available for grant to founder shareholders (in shares)     12,500,000   12,500,000                         12,500,000
Proceeds from issuance of preferred stock         $ 1,250                          
Number option additionally available for grant to founder shareholders (in shares)       12,500,000                            
Preferred Stock Issued | Founding Shareholder | J Stephen Holmes                                    
Class of Warrant or Right [Line Items]                                    
Share-based compensation arrangement by share-based payment award, options, forfeitures in period (in shares)   11,790,000                                
Common Stock Issued                                    
Class of Warrant or Right [Line Items]                                    
Common stock issued for convertible securities (in shares)                 4,673,321     9,621,774 12,500          
Stock Option | Chief Executive Officer | Scott W Absher                                    
Class of Warrant or Right [Line Items]                                    
Number of options available for grant to founder shareholders (in shares)                                   25,000,000
Stock Option | Preferred Stock Issued                                    
Class of Warrant or Right [Line Items]                                    
Convertible preferred stock (in shares)                                 24,634,560  
Common Share Units                                    
Class of Warrant or Right [Line Items]                                    
Shares issued upon conversion (in shares)                     294,490              
Common shares lock up period                     6 months              
Common Share Units | Chief Executive Officer | Scott W Absher                                    
Class of Warrant or Right [Line Items]                                    
Shares issued upon conversion (in shares)       12,500,000                            
Common shares lock up period       24 months                            
Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)           $ 2.35     $ 2.35     $ 2.35            
Class of warrant or right, outstanding (in shares)           22,440,225     22,440,225     22,440,225            
Warrants | Jan 2022 Common Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)           $ 1.55     $ 1.55     $ 1.55            
Class of warrant or right, outstanding (in shares)           9,896,906     9,896,906     9,896,906            
Warrants | Sep 2021 Underwriter Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)           $ 1.75     $ 1.75     $ 1.75            
Class of warrant or right, outstanding (in shares)           376,176 376,176   376,176     376,176            
Private Placement                                    
Class of Warrant or Right [Line Items]                                    
Payments of stock issuance costs             $ 900,000                      
Proceeds from issuance of private placement             $ 12,000,000 $ 12,000,000                    
Shares of common stock issued (in shares)             2,850,000                      
Sale of stock, placement fee             7.00%                      
Private Placement | Common Stock Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)             $ 1.595                      
Warrants to acquire shares of common stock (in shares)             2,850,000                      
Number of share of common stock per warrant (in shares)             1                      
Sale of stock, stock and warrant price per share (in dollars per share)             $ 1.595                      
Warrants term             5 years                      
Private Placement | Pre-Funded Warrant                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)             $ 0.0001                      
Number of share of common stock per warrant (in shares)             1                      
Class of warrant or right, outstanding (in shares)             4,673,511                      
Sale of stock, stock and warrant price per share (in dollars per share)             $ 1.5949                      
Private Placement | Common Stock And Pre-Funded Warrants                                    
Class of Warrant or Right [Line Items]                                    
Warrants to acquire shares of common stock (in shares)             7,523,511                      
Private Placement | Placement Warrants                                    
Class of Warrant or Right [Line Items]                                    
Exercise price of warrants (in dollars per share)             $ 1.7545                      
Warrants term             4 years                      
Warrants and rights outstanding, requisite exercise period             6 months                      
Private Placement | Common Stock Issued                                    
Class of Warrant or Right [Line Items]                                    
Shares of common stock issued (in shares)                   2,320,000   2,850,000 2,320,000