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Stockholders' Equity - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity compensation expense        
Total equity compensation expense $ 5,537 $ 4,466 $ 11,567 $ 8,748
Research and development expense        
Equity compensation expense        
Total equity compensation expense 2,313 1,966 5,066 3,902
Selling, general and administrative expenses        
Equity compensation expense        
Total equity compensation expense $ 3,224 $ 2,500 $ 6,501 $ 4,846