General form of registration statement for all companies including face-amount certificate companies

Equity Awards (Details)

v3.23.2
Equity Awards (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 13, 2023
Aug. 31, 2022
Aug. 30, 2022
May 31, 2021
Jan. 31, 2023
Nov. 30, 2022
Mar. 31, 2023
Feb. 28, 2023
Aug. 31, 2022
Jun. 30, 2022
Feb. 28, 2022
 [1]
Nov. 30, 2021
 [1]
Aug. 31, 2021
 [1]
Feb. 28, 2023
Feb. 28, 2022
 [1]
May 31, 2022
May 31, 2021
Class of Stock [Line Items]                                  
Exercise price of share             $ 0.50                    
Shares issued during the period new issues shares 400,000 4,600,000           500,000               7,900,000  
Proceeds from warrant transactions, net of offering costs                           $ 2,815,000 $ 5,390,000 $ 5,390,000 $ 17,060,000
Number Of Warrants In Fixed Combination Issue Of Securities                               0.3  
Common stock warrants to purchase shares   5,500,000         71,100,000   5,500,000                
Term of warrants         10 years   5 years                    
Warrant covering common stock shares purchased, percentage   75.00% 50.00%                         12.00%  
Stock issued for private offerings               $ 18,045,000     $ 3,552,000         $ 46,511,000 $ 1,000,000
Placement agent fees and expenses             $ 2,000,000.0     $ 2,800,000              
Maximum                                  
Class of Stock [Line Items]                                  
Exercise price of share   $ 0.255   $ 1.00       $ 0.75 $ 0.255         $ 0.75   $ 1.35 $ 1.00
Minimum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 0.45       $ 0.45           $ 0.45   $ 0.45 $ 0.45
Warrant covering common stock shares purchased, percentage                 0.40%                
Private Equity Offering                                  
Class of Stock [Line Items]                                  
Shares issued during the period new issues shares                                 8,900,000
Number Of Common Shares In Fixed Combination Issue Of shares       1                         1
Number Of Warrants In Fixed Combination Issue Of Securities       1                         1
Term of warrants       5 years                         5 years
Stock issued for private offerings                 $ 17,544,000     $ 27,307,000 $ 2,872,000        
Private Equity Offering | Maximum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 1.80                         $ 1.80
Private Equity Offering | Minimum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 0.40                         $ 0.40
Accredited Investors [Member]                                  
Class of Stock [Line Items]                                  
Shares issued during the period new issues shares       4,100,000           85,400,000           34,600,000 8,800,000
Common stock warrants to purchase shares       900,000     71.1                   900,000
Stock issued for private offerings             $ 14,400,000     $ 18,900,000           $ 5,400,000  
Accredited Investors [Member] | Maximum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 1.00                       $ 1.00 $ 1.00
Accredited Investors [Member] | Minimum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 0.40                       $ 0.45 $ 0.40
Private Warrant Exchange [Member]                                  
Class of Stock [Line Items]                                  
Exercise price of share           $ 1.00                      
Shares issued during the period new issues shares       36,200,000                         35,800,000
Proceeds from warrant transactions, net of offering costs                                 $ 16,200,000
Common stock warrants to purchase shares                               7,900,000  
Warrants exchanged (in shares)                               3,500,000 32,600,000
Stock issued for private offerings       $ 34,900,000                          
Placement agent fees and expenses           $ 2,100,000                     $ 500,000
Private Warrant Exchange [Member] | Maximum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 0.90                         $ 0.90
Private Warrant Exchange [Member] | Minimum                                  
Class of Stock [Line Items]                                  
Exercise price of share       $ 0.21                         $ 0.21
Private Warrant Exchange, Non-Inducement Shares [Member]                                  
Class of Stock [Line Items]                                  
Shares issued during the period new issues shares       400,000                          
Stock Subscription Agreements [Member]                                  
Class of Stock [Line Items]                                  
Exercise price of share                               $ 1.00  
Shares issued during the period new issues shares                               11,400,000  
Proceeds from warrant transactions, net of offering costs                               $ 1,400,000  
Number Of Common Shares In Fixed Combination Issue Of shares                               1  
Common stock warrants to purchase shares                               5,000,000.0  
Proceeds from issuance of common stock                               $ 11,400,000  
Stock issued for private offerings                               10,000,000.0  
Placement agent fees and expenses                               $ 50,000  
Second Private Placement [Member]                                  
Class of Stock [Line Items]                                  
Exercise price of share                   $ 0.306           $ 0.30  
Shares issued during the period new issues shares             65.6                 34,600,000  
Proceeds from warrant transactions, net of offering costs                               $ 7,600,000  
Number Of Common Shares In Fixed Combination Issue Of shares         1         1           1  
Number Of Warrants In Fixed Combination Issue Of Securities         1         1           1  
Common stock warrants to purchase shares                   64,000,000.0              
Term of warrants                   5 years           5 years  
Allotment to placement agent                                  
Class of Stock [Line Items]                                  
Exercise price of share     $ 0.40   $ 0.23         $ 0.255           $ 0.255  
Common stock warrants to purchase shares         10,700,000         19,400,000              
Term of warrants                   10 years           10 years  
Warrant covering common stock shares purchased, percentage         15.00%   12.00%     13.00%           13.00%  
Placement agent fees and expenses             $ 25,000     $ 50,000           $ 50,000  
Allotment to placement agent | Maximum                                  
Class of Stock [Line Items]                                  
Exercise price of share   $ 0.306             $ 0.306                
[1] See Note 2, Summary of Significant Accounting Policies—Revision and Restatement of Financial Statements.