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Stock-Based Compensation - Compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stock Based Compensation    
Stock-based compensation $ 9,870 $ 1,801
Operating expense    
Stock Based Compensation    
Stock-based compensation 3 1
Selling, general and administrative    
Stock Based Compensation    
Stock-based compensation $ 9,867 $ 1,800