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Summary of Significant Accounting Policies - Summary of Product Revenue by Geographical Locations of Customers (Detail) - Product - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total product revenue | $ 18,019 | $ 15,399 | $ 53,732 | $ 44,383
North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total product revenue | 4,792 | 3,117 | 14,501 | 8,653
Europe, Middle East and Africa |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total product revenue | 12,806 | 11,866 | 38,207 | 34,890
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total product revenue | $ 421 | $ 416 | $ 1,024 | $ 840

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- Definition Amount, excluding 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 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: 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 + Details
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