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Stock Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 18, 2021
Jun. 28, 2021
Oct. 01, 2019
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of options granted (in shares)             300,000    
Outstanding Weighted Average Exercise Price, Granted (in dollars per share)             $ 3.25    
Unrecognized stock-based compensation expense for stock options       $ 681,000     $ 681,000    
2019 Equity incentive plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares available for grant (in shares)       2,513,500     2,513,500    
Stock options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock option compensation expense       $ 64,000       $ 0  
Unrecognized stock-based compensation expense for stock options, period             2 years 9 months    
Stock options | Share-based Payment Arrangement, Employee                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of options granted (in shares)   300,000             0
Vesting period   3 years              
Exercise period   10 years              
Outstanding Weighted Average Exercise Price, Granted (in dollars per share)   $ 3.25              
Share-based compensation vested in period, fair Value   $ 745,000              
Stock options | Share-based Payment Arrangement, Employee | Tranche One                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage             33.00%    
Stock options | Share-based Payment Arrangement, Employee | Tranche Two                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage             33.00%    
Stock options | Share-based Payment Arrangement, Employee | Tranche Three                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage             33.00%    
Restricted stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period             10 years    
Stock option compensation expense       $ 0   $ 0 $ 0 $ 0  
Award service period             5 years    
Granted, weighted average grant price (in dollars per share)             $ 15.80 $ 15.80  
Unvested restricted shares outstanding (in shares)       627   627 627 627  
RSUs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock-based compensation arrangement, vested in period, remain outstanding (in shares)             28,904    
Unrecognized stock-based compensation expense for other than options       $ 0     $ 0    
Unvested restricted shares outstanding (in shares)       0     0    
RSUs | Nonemployee                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted, restricted shares (in shares) 200,000                
Granted, weighted average grant price (in dollars per share) $ 2.19                
RSUs | Share-based Payment Arrangement, Employee                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock option compensation expense               $ 6,000  
Granted, restricted shares (in shares)                 0
Share-based compensation arrangement by share-based payment award, grand value in period             $ 438,000    
Series D Preferred Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Forfeited, restricted shares (in shares)         81       28,618
Series D Preferred Stock | Restricted stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period     2 years            
Stock option compensation expense       $ 0   $ 28,000 33,000 $ 83,000  
Issuance of restricted stock (in shares)     49,967            
Unrecognized stock-based compensation expense for other than options       $ 0     $ 0    
Forfeited, restricted shares (in shares)           1,086 81 32,891  
Unvested restricted shares outstanding (in shares)       0     0