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Business Segment and Geographic Information - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments | segment	1
Revenues	$ 280.5	$ 184.4
Revenue, Percentage	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 210.5	$ 145.4
Revenue, Percentage	75.00%	79.00%
Outside of the United States
Disaggregation of Revenue [Line Items]
Revenues	$ 70.0	$ 39.0
Revenue, Percentage	25.00%	21.00%
Distributor
Disaggregation of Revenue [Line Items]
Revenues	$ 187.8	$ 118.3
Revenue, Percentage	67.00%	64.00%
Direct
Disaggregation of Revenue [Line Items]
Revenues	$ 92.7	$ 66.1
Revenue, Percentage	33.00%	36.00%

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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