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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) - Contingent Consideration - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent consideration liability (asset) $ 928 $ 1,024 $ 1,842 $ 1,886
Revenue-based Payments        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent consideration liability (asset) $ 928 $ 874    
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 5.00% 5.00%    
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%    
Contingent Receivable [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent consideration liability (asset) $ (681)      
Contingent Receivable [Member] | Discounted Cash Flow | Fair Value, Inputs, Level 3        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Probability of milestone payment 75.00%      
Discount rate 10.00%      
Other Payments        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]        
Contingent consideration liability (asset)   $ 150    
Other Payments | 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%