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Business Segment and Geographic Information - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Geographical_Market segment | Jun. 30, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 1 |
Number of primary geographical markets | Geographical_Market |  |  | 2 |
Revenues | $ 336.4 | $ 242.5 | $ 616.9 | $ 426.9
Revenue, percentage | 100.00% | 100.00% | 100.00% | 100.00%
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 266.3 | $ 189.6 | $ 476.8 | $ 335.0
Revenue, percentage | 79.00% | 78.00% | 77.00% | 78.00%
Outside of the United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 70.1 | $ 52.9 | $ 140.1 | $ 91.9
Revenue, percentage | 21.00% | 22.00% | 23.00% | 22.00%
Distributor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 221.8 | $ 158.4 | $ 409.6 | $ 276.7
Revenue, percentage | 66.00% | 65.00% | 66.00% | 65.00%
Direct |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 114.6 | $ 84.1 | $ 207.3 | $ 150.2
Revenue, percentage | 34.00% | 35.00% | 34.00% | 35.00%

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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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