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Stock-Based Compensation - Allocation of Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Allocation of stock-based compensation        
Stock-based compensation expense $ 4,734 $ 2,048 $ 7,935 $ 3,465
Cost of sales        
Allocation of stock-based compensation        
Stock-based compensation expense 141 44 270 82
Selling, general and administrative        
Allocation of stock-based compensation        
Stock-based compensation expense 3,470 1,391 5,784 2,503
Research and development        
Allocation of stock-based compensation        
Stock-based compensation expense $ 1,123 $ 613 $ 1,881 $ 880