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Stock-Based Compensation - Performance Based Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 17, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair value assumptions:      
Stock based compensation expenses   $ 475 $ 4,952
Stock option awards - Performance based awards      
Number of Shares      
Outstanding at the beginning of the period (in shares)   388,125  
Granted (in shares)   750,000  
Forfeited (in shares)   (388,125)  
Outstanding at the end of the period (in shares)   750,000 388,125
Exercisable at end of period (in shares)   0  
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share)   $ 4.70  
Granted (in dollars per share)   2.20  
Forfeited (in dollars per share)   (4.70)  
Outstanding at the end of the period (in dollars per share)   2.20 $ 4.70
Exercise price (in dollars per share)   $ 0  
Fair value assumptions:      
Expected stock price volatility   74.40%  
Risk-free interest rate   0.40%  
Dividend yield rate   0.00%  
Term (years)   5 years 8 months 12 days  
Stock based compensation expenses   $ (240) $ 443
Unrecognized stock-based compensation expenses   $ 200  
Forfeited performance-based stock options (in shares)   388,125  
Number of shares per unit   1  
Stock option awards - Performance based awards | President and Chief Executive Officer      
Number of Shares      
Forfeited (in shares) (388,125)    
Fair value assumptions:      
Forfeited performance-based stock options (in shares) 388,125    
Allocated share-based compensation expense, reduction due to forfeitures $ 700