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Revenues (Tables)
12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
Year Ended December 31, 2018
(in thousands)
United StatesUnited KingdomGermanyRest of the worldTotal
Instruments, equipment, software and accessories$79,614$13,690$13,193$8,571$115,068
Service, maintenance and warranty contracts4,438832366705,706
Total revenues$84,052$14,522$13,559$8,641$120,774
Year Ended December 31, 2017
(in thousands)
United StatesUnited KingdomGermanyRest of the worldTotal
Instruments, equipment, software and accessories$40,240$14,224$10,766$9,392$74,622
Service, maintenance and warranty contracts1,481819396892,785
Total revenues$41,721$15,043$11,162$9,481$77,407
Service Contracts [Member]  
Deferred Revenue Arrangement [Line Items]  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
Year Ended December 31, 2018
(in thousands)
Service ContractsCustomer AdvancesTotal
Balance, beginning of period$505$-$505
Addition due to business combination8482,1282,976
Deferral of revenue4,3051,2105,515
Recognition of deferred revenue(3,984)(1,177)(5,161)
Effect of foreign currency translation(15)-(15)
Balance, end of period$1,659$2,161$3,820