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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Contingent Consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Contingent consideration liability $ 10,956 $ 683 $ 1,024
Revenue-based Payments      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Contingent consideration liability $ 10,956 $ 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% 10.00%  
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 $ 760 $ 528  
Other Payments | Discounted Cash Flow | Fair Value, Inputs, Level 3      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Probability of milestone payment 75.00% 57.00%  
Discount rate 10.00% 10.00%