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Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock-based compensation expense $ 4,024 $ 2,301 $ 7,015 $ 3,922
Cost of revenues        
Stock-based compensation expense 452 83 691 151
Selling, general and administrative        
Stock-based compensation expense 3,222 2,043 5,727 3,488
Engineering and development        
Stock-based compensation expense $ 350 $ 175 $ 597 $ 283