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Stock-Based Compensation - Stock-Option Compensation Award with Market Conditions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 10, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation        
Stock option awards granted (shares)   884,479    
Stock based compensation expense   $ 5,759 $ 3,820 $ 5,394
Performance options award | Chief Executive Officer        
Stock-Based Compensation        
Stock option awards granted (shares) 450,000      
Fair value of stock options granted $ 501      
Stock based compensation expense   $ 37    
Performance options award | Vest on average thirty day share price of $4 per share        
Stock-Based Compensation        
Award vesting rights (percent) 50.00%      
Market conditions, average number of days for share price target 30 days      
Market conditions, target average thirty day share price (usd per share) $ 4.00      
Vesting period (years) 1 year 3 months 7 days      
Performance options award | Vest on average thirty day share price of $5 per share        
Stock-Based Compensation        
Award vesting rights (percent) 50.00%      
Market conditions, average number of days for share price target 30 days      
Market conditions, target average thirty day share price (usd per share) $ 5.00      
Vesting period (years) 1 year 9 months