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Summary of Significant Accounting Policies - Summary of Product Revenue by Geographical Locations of Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Total product revenue | $ 13,564 | $ 7,006
North America |  |
Disaggregation Of Revenue [Line Items] |  |
Total product revenue | 2,387 | 1,065
Europe, Middle East and Africa |  |
Disaggregation Of Revenue [Line Items] |  |
Total product revenue | 11,006 | 5,911
Other |  |
Disaggregation Of Revenue [Line Items] |  |
Total product revenue | $ 171 | $ 30

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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