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Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Function (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
Costs of revenues        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense 209 105 352 190
Research and development        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense 394 193 653 357
Selling, general, and administrative        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation expense $ 1,219 $ 1,348 $ 2,066 $ 1,708