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Share-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Feb. 28, 2021
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock repurchase program, period (in years)         3 years        
Common stock repurchased and retired           $ 4,195,000 $ 963,000    
Non-employee Directors | Restricted stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)   127,744   143,145     222,912    
Granted (in dollars per share)   $ 5.01   $ 5.03          
Vested and released (in shares) 63,620 79,525              
Share-based payment award, options, grants in period, weighted average grant date fair value (in dollars per share)             $ 6.46    
Employee | Restricted stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)   392,419              
Share-based payment award, options, grants in period, weighted average grant date fair value (in dollars per share)   $ 4.96              
Employee | Restricted stock | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)     289,592            
Granted (in dollars per share)     $ 4.68            
Employee | Restricted stock | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)     275,107            
Granted (in dollars per share)     $ 4.71            
Class A Common Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock repurchase program, amount authorized         $ 60,000,000.0   $ 60,000,000.0    
Common stock repurchased and retired (in shares)               0 943,149
Common stock repurchased and retired                 $ 5,200,000