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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options      
Stock based compensation expense $ 26 $ 75  
Weighted Average Remaining Contractual Life      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 0    
Stock Options      
Stock Options      
Expiration period 10 years    
Shares      
Options outstanding at the beginning of the period (in shares) 3 3  
Cancelled or expired (3)    
Options outstanding at the end of the period (in shares)   3 3
Weighted Average Exercise Price      
Options outstanding at the beginning of the period (in dollars per share) $ 7.40 $ 7.40  
Cancelled or expired (in dollars per share) 7.40    
Options outstanding at the end of the period (in dollars per share)   $ 7.40 $ 7.40
Weighted Average Remaining Contractual Life      
Options outstanding   7 years 10 months 2 days 8 years 10 months 2 days
Stock price $ 9.00 $ 4.75 $ 2.10