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Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Product revenues	$ 228,613	$ 257,921
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
United States
Segment Reporting Information [Line Items]
Product revenues	$ 105,918	$ 118,454
Germany
Segment Reporting Information [Line Items]
Product revenues	16,830	23,210
South Korea
Segment Reporting Information [Line Items]
Product revenues	16,417	14,978
Japan
Segment Reporting Information [Line Items]
Product revenues	16,137	18,591
China
Segment Reporting Information [Line Items]
Product revenues	13,003	15,597
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	10,073	12,142
Canada
Segment Reporting Information [Line Items]
Product revenues	8,262	10,291
Romania
Segment Reporting Information [Line Items]
Product revenues	7,659	6,922
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	6,964	8,832
Other
Segment Reporting Information [Line Items]
Product revenues	27,350	28,904
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 122,695	$ 139,467

X

- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

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- Definition

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+ References

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