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Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock-based compensation expense $ 15,345 $ 8,916 $ 16,523
Cost of revenues      
Stock-based compensation expense 1,620 371 1,479
Selling, general and administrative      
Stock-based compensation expense 12,425 7,862 13,946
Engineering and development      
Stock-based compensation expense $ 1,300 $ 683 $ 1,098