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Stockholders' Equity (Share-Based Compensation Expense Included in the Statement of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share based compensation $ 3,919 $ 4,370 $ 14,837 $ 16,165
Cost of revenues        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share based compensation 889 947 2,967 3,276
Selling, distribution and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share based compensation 164 120 438 350
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share based compensation 2,533 2,899 10,069 11,170
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share based compensation $ 333 $ 404 $ 1,363 $ 1,369