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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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