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Business Segment and Geographic Information - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	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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Number Of Primary Geographical Markets

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Revenue, Percentage

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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

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