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Stockholders' Equity and Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Stock-based compensation expense $ 8,054 $ 3,763
Cost of revenues    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Stock-based compensation expense 491 345
Research and development    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Stock-based compensation expense 2,918 1,782
Sales, general and administrative    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Stock-based compensation expense $ 4,645 $ 1,636