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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 04, 2020
$ / shares
shares
Jun. 01, 2020
$ / shares
shares
May 29, 2020
USD ($)
shares
$ / shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
shares
Jan. 19, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested (in shares) 30,000.00              
Vesting of restricted stock units | $       $ 115 [1]   $ 1,800    
Payments for vesting of phantom shares, number of shares per share granted     1          
Payments for vesting of phantom shares | $     $ 1,800          
Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested (in shares)       581,000 583,000 179,085    
Vested (in dollars per share) | $ / shares           $ 11.05    
Phantom shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested (in shares)     1,237,500          
Performance and Incentive Pay Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of issued and outstanding shares of common stock     5.00%          
Number of shares available for grant     2,508,002 1,146,784   1,819,814   2,508,002
Performance and Incentive Pay Plan | Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested (in shares)   100,000 100,000       0  
Vested (in dollars per share) | $ / shares $ 7.43 $ 11.50 $ 12.65          
Performance and Incentive Pay Plan | Restricted stock units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       2 years   2 years    
Performance and Incentive Pay Plan | Restricted stock units | Minimum | Nonemployee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       2 years   2 years    
Performance and Incentive Pay Plan | Restricted stock units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years   3 years    
Performance and Incentive Pay Plan | Restricted stock units | Maximum | Nonemployee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years   3 years    
Performance and Incentive Pay Plan | Performance shares | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       2 years   2 years    
Performance and Incentive Pay Plan | Performance shares | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years   3 years    
[1] As of March 31, 2021, there were 16,441 unissued shares underlying restricted stock units that had vested.