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Equity and Stock Compensation Plans - Stock Option Grants and Unrestricted Stock Grants (Details)
1 Months Ended 2 Months Ended 6 Months Ended 12 Months Ended
May 31, 2020
shares
Mar. 31, 2020
shares
Oct. 31, 2019
shares
Sep. 30, 2019
shares
Nov. 30, 2020
shares
Dec. 31, 2020
installment
$ / shares
shares
Dec. 31, 2021
USD ($)
installment
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
installment
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Total stock-based compensation expense             $ 1,567,000 $ 838,000  
Stock options                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of stock options granted | shares             2,875,000 50,000  
Number of options outstanding | shares             3,240,000    
Number of shares vested | shares             218,748    
Weighted average exercise price of options outstanding | $ / shares             $ 6.00    
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term             9 years    
Weighted average remaining contractual term             7 years 11 months 1 day    
Aggregate intrinsic value of options outstanding             $ 0    
Aggregate intrinsic value of options exercisable             0    
Unrestricted Stock | 2020 Grant                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unamortized share-based compensation charges               $ 0  
Unrestricted Stock | 2019 Grant | Directors, officers and employees                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of installment | installment                 4
Total stock-based compensation expense                 $ 400,000
Number of unrestricted stock granted | shares     120,000 120,000         120,000
Stock-based compensation expense charged to expense             84,000 $ 84,000 $ 23,000
Remaining stock based compensation expense             $ 145,000    
Unrestricted Stock | 2001 Nonqualified Stock Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of shares granted (in shares) | shares             56,553 256,250  
Total stock-based compensation expense             $ 300,000    
Unamortized share-based compensation charges             $ 0    
Unrestricted Stock | 2001 Nonqualified Stock Plan | 2020 Grant                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of shares granted (in shares) | shares         13,250        
Unrestricted Stock | 2001 Nonqualified Stock Plan | 2020 Grant | Director                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of shares granted (in shares) | shares             56,553    
Number of installment | installment             2    
Unrestricted Stock | 2001 Nonqualified Stock Plan | 2020 Grant | Directors, officers and employees                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of shares granted (in shares) | shares 243,000 243,000           256,250  
Number of installment | installment           2      
Total stock-based compensation expense               $ 700,000  
Equity Option                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of stock options granted | shares             2,875,000 50,000  
Number of options outstanding | shares           425,000 3,240,000 425,000 435,000
Weighted average exercise price of options outstanding | $ / shares           $ 6.00 $ 4.97 $ 6.00 $ 6.00
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term             9 years    
Amount of unrecognized compensation expense related to non-vested options             $ 4,200,000    
Weighted average period for nonvested options             3 years