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Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-based compensation expense $ 4,148 $ 2,433 $ 11,163 $ 6,355
Cost of Revenues [Member]        
Stock-based compensation expense 463 86 1,154 237
Selling, general and administrative        
Stock-based compensation expense 3,322 2,143 9,050 5,141
Engineering and development        
Stock-based compensation expense $ 363 $ 204 $ 959 $ 977