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Share-based Compensations - Recognized Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Recognized share-based compensation        
Total share-based compensation expense $ 4,367 $ 2,974 $ 7,605 $ 6,620
Cost of sales        
Recognized share-based compensation        
Total share-based compensation expense 650 474 1,146 995
Research and development        
Recognized share-based compensation        
Total share-based compensation expense 1,132 613 1,949 1,486
Selling, general and administrative        
Recognized share-based compensation        
Total share-based compensation expense $ 2,585 $ 1,887 $ 4,510 $ 4,139
Restricted stock awards | Minimum        
Share-based compensation        
Expiration term     1 year  
Restricted stock awards | Maximum        
Share-based compensation        
Expiration term     5 years