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Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Number of customers	1	1	1
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of total net revenues	13.40%	13.00%	16.40%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | China [Member]
Segment Reporting Information [Line Items]
Percentage of total net revenues	37.40%	35.80%	32.10%

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 21
-Subparagraph (a)
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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X

- 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.

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- Definition

Number of customers.

+ References

No definition available.

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