Segment Information and Major Customers - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) Customer Segment Category	Dec. 31, 2016 USD ($) Customer	Dec. 31, 2015 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	3	3
Long-lived assets	$ 85.1	$ 84.5
U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	80.6	79.9
Outside U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 4.5	$ 4.6
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 1 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	40.00%	24.00%	20.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 2 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	16.00%	19.00%	17.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Customer 3 [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		12.00%	14.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| The Five Largest Customers Other Than Those With More Than 10% Of Revenues [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	15.00%	13.00%	14.00%

Sales information by product category.

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- Definition

Number of customers comprising more than the threshold revenue levels.

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 21
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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&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.

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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.

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No definition available.

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