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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Contingent Consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Contingent consideration liability $ 1,024 $ 1,886 $ 2,526
Revenue-based Payments      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Contingent consideration liability $ 874 $ 1,610  
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% 90.00%  
Revenue-based Payments | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discount rate 5.00% 1.00%  
Revenue-based Payments | Maximum | Discounted Cash Flow | Fair Value, Inputs, Level 3      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Discount rate 15.00% 14.00%  
Other Payments      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Contingent consideration liability $ 150 $ 276  
Other 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%  
Discount rate 0.00% 5.00%