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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Contingent Consideration - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration liability $ 11,077 $ 683 $ 5,572 $ 689 $ 898 $ 1,024
Revenue-based Payments            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration liability $ 11,077 $ 683        
Revenue-based Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Probability of milestone payment 100.00% 100.00%        
Revenue-based Payments | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Discount rate 9.90% 9.90%        
Revenue-based Payments | Maximum | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Discount rate 15.00% 15.00%        
Other Payments            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration asset $ 528 $ 528        
Other Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Probability of milestone payment 57.00% 57.00%        
Discount rate 10.00% 10.00%