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Stock-Based Compensation Expense - Allocation of Recognized Period Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share-based compensation $ 3,428 $ 2,523 $ 6,205 $ 4,289
Cost of sales        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share-based compensation 347 355 686 607
Research and development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share-based compensation 262 281 547 473
Selling, general and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share-based compensation $ 2,819 $ 1,887 $ 4,972 $ 3,209