Sales information by product category.

No definition available.

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- Definition

Number of customers comprising more than the threshold revenue levels.

+ References

No definition available.

+ Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 275
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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Segment Information and Major Customers - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Customer Segment Category	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 Customer
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	2
Number of categories \| Category	3
Number of single customer comprising more than 10% of revenue \| Customer	2	2	3
Long-lived assets	$ 80.6	$ 85.1
U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	77.3	80.6
Outside U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 3.3	$ 4.5
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 1 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	27.00%	40.00%	24.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 2 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	17.00%	16.00%	19.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 3 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage			12.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| The Five Largest Customers Other Than Those With More Than 10% Of Revenues and Excluding Distributors [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	18.00%	15.00%	13.00%