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Fair Value Measurements - Fair Value Inputs, Liabilities (Assets), Quantitative Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Contingent Consideration            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration liability $ 898 $ 1,024 $ 928 $ 1,949 $ 1,842 $ 1,886
Revenue-based Payments | Contingent Consideration            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration liability $ 898 $ 874        
Revenue-based Payments | Contingent Consideration | 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 | Contingent Consideration | Minimum | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Discount rate 10.00% 5.00%        
Revenue-based Payments | Contingent Consideration | 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 | Contingent Consideration            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration liability   $ 150        
Other Payments | Contingent Consideration | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Probability of milestone payment   100.00%        
Discount rate   0.00%        
Contingent Consideration | Contingent Receivable            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Contingent consideration asset $ (576)          
Contingent Consideration | Contingent Receivable | Discounted Cash Flow | Fair Value, Inputs, Level 3            
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]            
Probability of milestone payment 62.00%          
Discount rate 10.00%