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Revenues - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 33,858	$ 28,635	$ 31,522	$ 26,759	$ 21,646	$ 18,717	$ 18,958	$ 18,086	$ 120,774	$ 77,407
Instruments, equipment and accessories [Member]
Disaggregation of Revenue [Line Items]
Revenues									115,068	74,622
Service, maintenance and warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Revenues									5,706	2,785
Segment, Geographical, United States [Member]
Disaggregation of Revenue [Line Items]
Revenues									84,052	41,721
Segment, Geographical, United States [Member] | Instruments, equipment and accessories [Member]
Disaggregation of Revenue [Line Items]
Revenues									79,614	40,240
Segment, Geographical, United States [Member] | Service, maintenance and warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Revenues									4,438	1,481
Segment, Geographical, United Kingdom [Member]
Disaggregation of Revenue [Line Items]
Revenues									14,522	15,043
Segment, Geographical, United Kingdom [Member] | Instruments, equipment and accessories [Member]
Disaggregation of Revenue [Line Items]
Revenues									13,690	14,224
Segment, Geographical, United Kingdom [Member] | Service, maintenance and warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Revenues									832	819
Segment, Geographical, Germany [Member]
Disaggregation of Revenue [Line Items]
Revenues									13,559	11,162
Segment, Geographical, Germany [Member] | Instruments, equipment and accessories [Member]
Disaggregation of Revenue [Line Items]
Revenues									13,193	10,766
Segment, Geographical, Germany [Member] | Service, maintenance and warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Revenues									366	396
Rest Of The World [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,641	9,481
Rest Of The World [Member] | Instruments, equipment and accessories [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,571	9,392
Rest Of The World [Member] | Service, maintenance and warranty contracts [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 70	$ 89

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+ References

No definition available.

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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

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