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Stockholders' Equity - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Equity compensation expense        
Total equity compensation expense $ 5,500 $ 4,338 $ 17,067 $ 13,087
Research and development expense        
Equity compensation expense        
Total equity compensation expense 2,390 2,109 7,456 6,011
Selling, general and administrative expense        
Equity compensation expense        
Total equity compensation expense $ 3,110 $ 2,229 $ 9,611 $ 7,076