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Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Award Type (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense $ 1,822 $ 1,646 $ 3,071 $ 2,255
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense 1,259 1,366 2,262 1,975
Performance-based Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense 76 $ 280 89 $ 280
RSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense 310   423  
ESPP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense $ 177   $ 297