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Fair value measurement - Level 3 Reconciliation (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Reconciliation of the beginning and ending balances related to the fair value of contingent consideration    
Balance at beginning of the period $ 961 $ 961
Payment of contingent consideration 0 0
Change in fair vale (961) 0
Balance at end of the period $ 0 $ 961