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Equity and Stock-based Compensation - Stock Option Grants and Unrestricted Stock Grants (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2021
installment
shares
Jan. 31, 2021
USD ($)
shares
Nov. 30, 2020
shares
Oct. 31, 2020
shares
Sep. 30, 2020
shares
Jul. 31, 2020
USD ($)
shares
May 31, 2020
shares
Mar. 31, 2020
shares
Jan. 31, 2020
USD ($)
shares
Jul. 31, 2019
USD ($)
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
shares
Dec. 31, 2020
installment
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
shares
Dec. 31, 2019
USD ($)
installment
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Total stock-based compensation expense                     $ 439 $ 230 $ 636   $ 313    
2001 Nonqualified Stock Plan | March 2019 Grant | Directors, officers and employees                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of stock options granted | shares                 56,605 58,548              
Number of common stock shares surrendered by employees withholding taxes | shares                 14,895 12,952              
Common stock value surrendered by employees withholding taxes                 $ 50,000 $ 43,000              
Stock options                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of stock options granted | shares                         2,875,000   50,000    
Unrestricted Stock | 2001 Nonqualified Stock Plan | 2019 Grant | Directors                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of unrestricted stock granted | shares 56,533                                
Number of installment | installment 2                                
Total stock-based compensation expense                         $ 300        
Stock-based compensation expense charged to expense                     100   100        
Remaining stock based compensation expense                     200   200        
Unrestricted Stock | 2001 Nonqualified Stock Plan | 2019 Grant | Directors, officers and employees                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of unrestricted stock granted | shares                               30,000 120,000
Number of installment | installment                                 3
Total stock-based compensation expense                                 $ 300
Stock-based compensation expense charged to expense                     42,000 21,000 42,000   $ 21,000    
Remaining stock based compensation expense                                 $ 200
Unrestricted Stock | 2001 Nonqualified Stock Plan | 2020 Grant | Directors, officers and employees                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Total stock-based compensation expense                         700        
Stock-based compensation expense charged to expense                       $ 200     $ 200    
Remaining stock based compensation expense                     $ 500   $ 500        
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 13,250                          
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 installment | installment                           2      
Number of shares granted (in shares) | shares             243,000 243,000               256,250  
Unrestricted Stock | 2001 Nonqualified Stock Plan | March and May 2020 Grant | Directors, officers and employees                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of stock options granted | shares           109,773                      
Number of common stock shares surrendered by employees withholding taxes | shares           11,727                      
Common stock value surrendered by employees withholding taxes           $ 100                      
Unrestricted Stock | 2001 Nonqualified Stock Plan | September and October 2019 Grant | Directors, officers and employees                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of stock options granted | shares       30,000 30,000                        
Unrestricted Stock | 2001 Nonqualified Stock Plan | March, May and November 2020 Grant | Directors, officers and employees                                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                                  
Number of stock options granted | shares   115,403                              
Number of common stock shares surrendered by employees withholding taxes | shares   15,347                              
Common stock value surrendered by employees withholding taxes   $ 100