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Leases - Components of Lease Expense included in Consolidated Statement of Income (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessor Lease Description [Line Items]
Total lease expense	$ 819
Selling, General and Administrative Expenses [Member]
Lessor Lease Description [Line Items]
Total lease expense	349
Research and Development Expenses [Member]
Lessor Lease Description [Line Items]
Total lease expense	454
Cost of Sales [Member]
Lessor Lease Description [Line Items]
Total lease expense	$ 16

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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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- Details

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- Details

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