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Stock-Based Compensation - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
award
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
award
shares
Jun. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $ $ 2,921 $ 1,121 $ 3,185 $ 6,649
Board of Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued (in shares)   34,059    
Stock-based compensation expense | $   $ 1,100    
RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted (in shares) 71,421      
Vesting period     3 years  
Performance-based RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted (in shares)     30,447  
Types of performance-based RSUs | award 2   2  
Ultimate payout, minimum (as a percent)     0.00%  
Ultimate payout, maximum (as a percent)     200.00%  
Market-based RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted (in shares)     71,038