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Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Product revenues	$ 243,326	$ 266,400	$ 501,247	$ 530,986
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	100.00%	100.00%	100.00%	100.00%
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United States
Segment Reporting Information [Line Items]
Product revenues	$ 110,632	$ 123,512	$ 229,086	$ 243,862
United States | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	45.50%	46.40%	45.70%	45.90%
Germany
Segment Reporting Information [Line Items]
Product revenues	$ 20,300	$ 23,626	$ 43,510	$ 45,988
Germany | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	8.30%	8.90%	8.70%	8.70%
Japan
Segment Reporting Information [Line Items]
Product revenues	$ 20,003	$ 13,275	$ 38,594	$ 26,848
Japan | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	8.20%	5.00%	7.70%	5.10%
China
Segment Reporting Information [Line Items]
Product revenues	$ 16,410	$ 24,927	$ 32,007	$ 49,131
China | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	6.70%	9.40%	6.40%	9.30%
South Korea
Segment Reporting Information [Line Items]
Product revenues	$ 15,577	$ 15,783	$ 30,555	$ 29,605
South Korea | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	6.40%	5.90%	6.10%	5.60%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	$ 10,009	$ 11,106	$ 22,151	$ 22,821
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.10%	4.20%	4.40%	4.30%
Canada
Segment Reporting Information [Line Items]
Product revenues	$ 10,102	$ 12,590	$ 20,393	$ 25,703
Canada | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.20%	4.70%	4.10%	4.80%
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	$ 6,833	$ 8,467	$ 15,665	$ 19,312
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	2.80%	3.20%	3.10%	3.60%
Other
Segment Reporting Information [Line Items]
Product revenues	$ 33,460	$ 33,114	$ 69,286	$ 67,716
Other | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	13.80%	12.40%	13.80%	12.80%
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 132,694	$ 142,888	$ 272,161	$ 287,124
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	54.50%	53.60%	54.30%	54.10%

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