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Revenues - Disaggregation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 28,202 | $ 26,759
Instruments, equipment software and accessories [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 26,757 | 25,604
Service, maintenance and warranty contracts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,445 | 1,155
Segment, Geographical, United States [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 19,814 | 17,043
Segment, Geographical, United States [Member] | Instruments, equipment software and accessories [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 18,671 | 16,147
Segment, Geographical, United States [Member] | Service, maintenance and warranty contracts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,143 | 896
Segment, Geographical, United Kingdom [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,319 | 3,696
Segment, Geographical, United Kingdom [Member] | Instruments, equipment software and accessories [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,129 | 3,495
Segment, Geographical, United Kingdom [Member] | Service, maintenance and warranty contracts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 190 | 201
Segment, Geographical, Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,010 | 3,759
Segment, Geographical, Germany [Member] | Instruments, equipment software and accessories [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,913 | 3,707
Segment, Geographical, Germany [Member] | Service, maintenance and warranty contracts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 97 | 52
Rest Of The World [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,059 | 2,261
Rest Of The World [Member] | Instruments, equipment software and accessories [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,044 | 2,255
Rest Of The World [Member] | Service, maintenance and warranty contracts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 15 | $ 6

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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