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Stock-Based Compensation - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost        
Total stock-based compensation expense $ 3,586 $ 3,614 $ 6,835 $ 6,072
Equity awards        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost        
Total stock-based compensation expense 3,178 2,772 5,841 5,778
Liability awards        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost        
Total stock-based compensation expense $ 408 $ 842 $ 994 $ 294