Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

v3.23.1
Stockholders' Equity - Narrative (Details)
3 Months Ended 9 Months Ended
Aug. 18, 2022
USD ($)
Aug. 04, 2022
USD ($)
$ / shares
shares
Jul. 31, 2022
USD ($)
Jul. 15, 2022
USD ($)
Apr. 22, 2022
USD ($)
$ / shares
shares
Mar. 08, 2022
shares
Aug. 31, 2021
USD ($)
$ / shares
shares
Aug. 16, 2021
USD ($)
$ / shares
shares
Aug. 12, 2021
USD ($)
$ / shares
shares
Jul. 21, 2021
USD ($)
$ / shares
shares
Feb. 04, 2020
$ / shares
Jan. 31, 2023
USD ($)
plan
shares
Oct. 31, 2022
USD ($)
Jan. 31, 2022
USD ($)
Jan. 31, 2023
USD ($)
plan
shares
Jan. 31, 2022
USD ($)
shares
May 12, 2023
Jul. 06, 2022
shares
Jul. 05, 2022
shares
Apr. 30, 2022
USD ($)
shares
Dec. 22, 2021
shares
Dec. 21, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Number of stock-based incentive plans | plan                       2     2              
Transfer of unused awards (in shares)           129,009                                
Common stock, shares authorized (in shares)                       60,000,000     60,000,000     60,000,000 40,000,000 60,000,000    
Preferred stock, shares authorized (in shares)                       1,000,000     1,000,000         1,000,000    
Preferred stock issued (in shares)                       0     0         0    
Preferred stock outstanding (in shares)                       0     0         0    
Proceeds from issuance of common stock | $                             $ 9,535 $ 0            
Stock based compensation expense | $                       $ 394,510   $ 700,697 899,176 1,965,567            
Share price (in dollars per share) | $ / shares                     $ 9.49                      
Deferred financing costs | $                       $ 155,041     $ 155,041         $ 369,902    
Treasury stock (in shares)                       155,486     155,486         155,486    
Treasury stock, value | $                       $ 1,817,414     $ 1,817,414         $ 1,817,414    
15% Senior Secured Note Due 2026 | Subsequent Event | Secured Debt                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Debt instrument, interest rate, stated percentage                                 15.00%          
Revolving Credit Facility | 2022 Revolving Credit Facility                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Deferred financing costs | $                       29,500     29,500              
Restricted Stock                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Stock based compensation expense | $                       $ 0   286,231 $ 0 $ 307,283            
Unvested shares of restricted common stock outstanding (in shares)                       0     0         0    
Expired (in shares)                             10,000 0            
Total unrecognized compensation expense | $                       $ 0     $ 0              
RSUs                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares granted (in shares)                             15,000              
Grant date fair value | $                 $ 1,000,000                          
Stock based compensation expense | $                       $ 394,510   397,241 $ 893,769 $ 1,532,147            
Share price (in dollars per share) | $ / shares                 $ 6.48                          
Unvested shares of restricted common stock outstanding (in shares)                       523,056     523,056         929,928    
Expired (in shares)                             0              
Forfeited (in shares)                             185,059              
Total unrecognized compensation expense | $                       $ 1,709,599     $ 1,709,599              
Weighted average recognition period                             1 year              
RSUs | Share-based Payment Arrangement, Tranche Three                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Unvested shares of restricted common stock outstanding (in shares)                       162,500     162,500              
Weighted average recognition period                     4 years                      
Minimum closing price of common stock (in dollars per share) | $ / shares                     $ 12                      
Consecutive trading days                     20 days                      
RSUs | Chief Financial Officer                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares granted (in shares)               125,000                            
Grant date fair value | $               $ 725,000                            
Share price (in dollars per share) | $ / shares               $ 5.80                            
RSUs | Chief Operating Officer                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares granted (in shares)                 80,000                          
RSUs | Chief Academic Officer                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares granted (in shares)                 80,000                          
RSUs | Chief Executive Officer                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares granted (in shares)                   125,000                        
Grant date fair value | $                   $ 873,750                        
Share price (in dollars per share) | $ / shares                   $ 6.99                        
Amortization expense | $     $ (242,708)                     121,354   169,896            
Amortization period of expense                   3 years                        
RSUs | Chief Nursing Officer                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Amortization expense | $       $ (139,431)               $ 91,531   112,155 $ 148,911 336,466            
Warrant                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Vesting period of warrant         5 years                                  
Warrant | Intercreditor Agreement                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Number of securities called by warrants or rights (in shares)         100,000                                  
Exercise price of warrants (in dollars per share) | $ / shares         $ 1.00                                  
Fair value of warrants outstanding | $         $ 118,000                                  
Deferred financing costs | $                       29,500     29,500         $ 118,000    
Loss on asset disposition | $                       29,500     88,500              
Exercise period of warrant         5 years                                  
Warrant | Revolving Credit Facility | 2022 Revolving Credit Facility                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Number of securities called by warrants or rights (in shares)         100,000                                  
Exercise price of warrants (in dollars per share) | $ / shares         $ 1.00                                  
Warrant | Revolving Credit Facility | Credit Facility Agreement                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Vesting period of warrant             14 months                              
Fair value of warrants outstanding | $             $ 137,500                              
Warrant | Leon and Toby Cooperman Family Foundation                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Number of securities called by warrants or rights (in shares)             50,000                              
Exercise price of warrants (in dollars per share) | $ / shares             $ 5.85                              
Loss on asset disposition | $                       11,168     33,504              
Exercise period of warrant             5 years                              
Warrant | Former Board of Director                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Amortization expense | $                       $ 7,000     $ 21,000              
Number of securities called by warrants or rights (in shares)                   25,000                        
Vesting period of warrant                   3 years                        
Exercise price of warrants (in dollars per share) | $ / shares                   $ 6.99                        
Fair value of warrants outstanding | $                   $ 84,000                        
Exercise period of warrant                   5 years                        
Equity Distribution Agreement                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Offering proceeds | $ $ 3,000,000                                          
Number of shares sold (in shares)                             11,840              
Common Stock | Lampert Capital Advisors                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares granted (in shares)   25,000                                        
Grant date fair value | $   $ 24,500                                        
Stock based compensation expense | $                         $ 24,500                  
Share price (in dollars per share) | $ / shares   $ 0.98                                        
Maximum | Preferred Stock                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Preferred stock, shares authorized (in shares)                       1,000,000     1,000,000              
Equity Incentive Plan                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Common stock, shares remaining for future issuance (in shares)                       1,210,797     1,210,797         812,763    
2018 Equity Incentive Plan                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Common stock, shares authorized (in shares)                                         2,350,000 1,600,000
2018 Equity Incentive Plan | RSUs                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Weighted average recognition period                             3 years              
Amortization expense | $                       $ 146,817   $ 146,817 $ 440,450 $ 293,633