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Stock-Based Compensation and Stock Options (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 01, 2021
employee
$ / shares
shares
May 29, 2020
employee
$ / shares
shares
Sep. 30, 2019
employee
$ / shares
shares
May 31, 2019
installment
$ / shares
shares
Jun. 30, 2018
$ / shares
shares
May 31, 2018
$ / shares
shares
Oct. 31, 2017
$ / shares
shares
Sep. 30, 2015
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award                                
Total stock-based compensation expense (reversal) | $                       $ 44        
Stock Options | Mr. Ralph Bartel                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)                 188,737              
Net settlement (in shares)                 112,901              
Stock Options | September 2015 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)                 600,000              
Stock Options | September 2015 Plan | Mr. Ralph Bartel                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)               400,000                
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares               $ 8.07                
Options exercised (in shares)                 500,000              
Stock Options | October 2017 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)                 300,000              
Stock Options | October 2017 Plan | Mr. Ralph Bartel                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)             400,000                 150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares             $ 6.95                  
Options exercised (in shares)                               250,000
Stock Options | September 2019 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)     300,000                          
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares     $ 10.79                          
Options vested and become exercisable annually (in shares)     75,000                          
Total stock-based compensation expense (reversal) | $                 $ 97 $ (362)     $ 248 $ 523    
Unrecognized stock-based compensation expense | $                 741       $ 741      
Expected duration for recognition of stock based compensation expense                         1 year 10 months 24 days      
Stock Options | September 2019 Plan | Mr. Ralph Bartel                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares     $ 10.79                          
Options vested and become exercisable annually (in shares)     400,000                          
Total stock-based compensation expense (reversal) | $                 382 382     $ 1,100 3,900    
Unrecognized stock-based compensation expense | $                 382       $ 382      
Expected duration for recognition of stock based compensation expense                         3 months      
Stock Options | September 2019 Plan | Key Employees                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)     50,000                          
Number of key employees | employee     6                          
Stock Options | May 2020 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)   100,000                     54,110   54,258  
Options forfeited (in shares)                         75,000   100,000  
Options vested and exercisable in future periods (in shares)                         100,000   75,000  
Share price (in dollars per share) | $ / shares   $ 3.49                            
Shares issued upon exercise of options (in shares)   300,000                            
Stock Options | May 2020 Plan | Mr. Ralph Bartel                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)   800,000                           1,900,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares   $ 3.49                            
Total stock-based compensation expense (reversal) | $                 385 385     $ 1,200 771    
Unrecognized stock-based compensation expense | $                 771       $ 771      
Expected duration for recognition of stock based compensation expense                         6 months      
Stock Options | May 2020 Plan | Key Employees                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)   200,000                     24,474      
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares   $ 3.49                            
Total stock-based compensation expense (reversal) | $                 49 59     $ 157 79    
Unrecognized stock-based compensation expense | $                 $ 491       $ 491      
Expected duration for recognition of stock based compensation expense                         2 years 6 months      
Options vested and exercisable in future periods (in shares)                         50,000      
Number of key employees | employee   2                            
Stock Options | May 2018 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)           50,000                    
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares           $ 14.70                    
Total stock-based compensation expense (reversal) | $                   $ 0       34    
Options forfeited (in shares)                             25,000  
Stock Options | June 2018 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)         50,000                      
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares         $ 16.65                      
Total stock-based compensation expense (reversal) | $                           $ (43)    
Options forfeited (in shares)                           37,500    
Stock Options | May 2019 Plan                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)       100,000                        
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares       $ 19.28                        
Total stock-based compensation expense (reversal) | $                     $ (107)          
Options forfeited (in shares)       75,000             75,000          
Number of installments | installment       3                        
Options canceled (in shares)                     25,000          
Stock Options | May 2019 Plan | September 2019                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Options vested and exercisable in future periods (in shares)       15,000                        
Stock Options | May 2019 Plan | May 2019                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Options vested (in shares)       10,000                        
Stock Options | May 2019 Plan | Tranche One                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Options vested and exercisable in future periods (in shares)       25,000                        
Stock Options | May 2019 Plan | Tranche Two                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Options vested and exercisable in future periods (in shares)       25,000                        
Stock Options | May 2019 Plan | Tranche Three                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Options vested and exercisable in future periods (in shares)       25,000                        
Stock Options | May 2019 Plan | Mr. Ralph Bartel                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares)                 367,086              
Options exercised (in shares)                 160,000              
Stock Options | June 2021 Plan | One Employee                                
Share-based Compensation Arrangement by Share-based Payment Award                                
Employee options granted to purchase shares of common stock (in shares) 50,000                              
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares $ 9.44                              
Total stock-based compensation expense (reversal) | $                 $ 62       $ 82      
Unrecognized stock-based compensation expense | $                 $ 492       $ 492      
Expected duration for recognition of stock based compensation expense                         3 years 3 months 18 days      
Number of key employees | employee 1