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Fair value measurement (Details 2) - Contingent consideration - Endeka and AWG - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation between the beginning and ending balances related to the fair value of contingent consideration    
Beginning balance $ 131 $ 1,942
Payment of contingent consideration (17) (1,000)
Change in fair value (114) (811)
Ending Balance $ 0 $ 131