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Stock-Based Compensation - Stock Appreciation Rights (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Weighted-Average Assumptions      
Risk-free interest rate (as percent)   1.38% 1.86%
Cash-settled stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period (in years) 7 years    
Exercise price (in dollars per share) $ 5.73    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Market Cap Price Per Share $ 10.00    
Weighted-Average Assumptions      
Expected term of cash-settled SARs (in years) 3 years 7 months 6 days    
Expected volatility factor (as percent) 124.50%    
Risk-free interest rate (as percent) 1.08%    
Cash-settled SARs      
Granted (in shares) 2,954    
Forfeited (in shares) (41)    
Ending balance (in shares) 2,913    
Weighted Average Fair Value Price Per Share      
Granted (in dollars per share) $ 0.66    
Forfeited (in dollars per share) 0.66    
Ending balance (in dollars per share) $ 0.66