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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair value measurements          
Earn-out payments paid $ 0 $ 10 $ 500 $ 20  
Recurring basis          
Fair value measurements          
Contingent Consideration         $ 502
Recurring basis | Level 3          
Fair value measurements          
Contingent Consideration         $ 502
Reconciliation of the beginning and ending balance for the Level 3 measurement          
Balance at the beginning of the period     502    
Payments     $ (502)