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Segment information - Schedule of Revenue by Geography Based on Customer Location (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 59,230 | $ 57,248 | $ 53,024 | $ 50,766 | $ 54,193 | $ 52,176 | $ 41,043 | $ 39,424 | $ 220,268 | $ 186,836 | $ 14,091
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 211,307 | 167,568 | 12,816
Outside of the United States [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  | $ 8,961 | $ 19,268 | $ 1,275
[1] | No individual country, other than disclosed above, exceeded 10% of our total consolidated revenue for any period presented

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales 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) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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