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Stockholders' Equity - Issuance of Common Stock (Details) - Directors - Restricted Stock
3 Months Ended 6 Months Ended
Jul. 01, 2019
director
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
May 20, 2019
USD ($)
Share-based compensation            
Fair value of equity grant award approved for each director           $ 50,000
Number of restricted stock awards granted | shares 5,708 0 0 0 0  
Number of directors granted restricted stock awards | director 2          
Number of directors who elected to receive cash in lieu of the stock | director 2          
Stock compensation expense before tax benefit   $ 0   $ 0    
Maximum            
Share-based compensation            
Stock compensation expense before tax benefit     $ 100,000   $ 100,000