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Revenues - Deferred revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Movement in Deferred Revenue [Roll Forward]    
Deferred Revenue, beginning balance $ 3,820 $ 505
Addition due to business combination   2,977
Deferral of revenue 956 1,321
Recognition of deferred revenue (1,071) (954)
Effect of foreign currency translation 10 4
Deferred Revenue, ending balance 3,715 3,853
Service Contracts [Member]    
Movement in Deferred Revenue [Roll Forward]    
Deferred Revenue, beginning balance 1,659 505
Addition due to business combination   849
Deferral of revenue 845 1,193
Recognition of deferred revenue (848) (758)
Effect of foreign currency translation 10 4
Deferred Revenue, ending balance 1,666 1,793
Customer Advances [Member]    
Movement in Deferred Revenue [Roll Forward]    
Deferred Revenue, beginning balance 2,161 0
Addition due to business combination   2,128
Deferral of revenue 111 128
Recognition of deferred revenue (223) (196)
Effect of foreign currency translation 0 0
Deferred Revenue, ending balance $ 2,049 $ 2,060