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Revenues - Allowance for doubtful debts (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
AllowanceForDoubtfulAccountsReceivableRollforward    
Balance, beginning of period $ 332 $ 193
Addition due to business combination 0 102
Bad debt expense 394 3
Bad debt (recoveries) (354) (23)
Effect of foreign currency translation adjustment (8) 26
Balance, end of period $ 364 $ 301