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Revenues - Product revenue by type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | $ 228,805 | $ 204,267 | $ 648,735 | $ 575,559
Hardware and software |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 144,305 | 125,733 | 399,548 | 345,215
Consumables |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 19,875 | 19,848 | 60,378 | 58,956
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 4,308 | 4,128 | 12,551 | 10,833
Product revenues |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | $ 168,488 | $ 149,709 | $ 472,477 | $ 415,004

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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