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Stock-Based Compensation - Stock Option Awards, Textuals (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from exercise of stock options $ 122,000 $ 58,000 $ 133,000
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 0 0 0
Tax benefit 0 0 0
Intrinsic value of options exercised 61,000 60,000 202,000
Proceeds from exercise of stock options $ 122,000 $ 58,000 $ 132,000
PRSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Option 1 | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years    
Option 2 | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years