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Fair Values of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets    
Cash equivalents $ 1,881 $ 9,569
Liabilities    
Contingent consideration - Current 2,531 2,775
Contingent consideration - Long-term   2,381
Liabilities, fair value 2,531 5,156
Fair Value, Inputs, Level 1    
Assets    
Cash equivalents 1,881 9,569
Fair Value, Inputs, Level 3    
Liabilities    
Contingent consideration - Current 2,531 2,775
Contingent consideration - Long-term   2,381
Liabilities, fair value $ 2,531 $ 5,156