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Stockholders' Equity - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity compensation expense    
Total equity compensation expense $ 6,030 $ 4,283
Research and development expense    
Equity compensation expense    
Total equity compensation expense 2,753 1,936
General and administrative expense    
Equity compensation expense    
Total equity compensation expense $ 3,277 $ 2,347