Segment Reporting (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Product revenues	$ 913,098	$ 971,684	$ 1,048,505
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
United States
Segment Reporting Information [Line Items]
Product revenues	$ 377,577	$ 440,316	$ 488,926
China
Segment Reporting Information [Line Items]
Product revenues	101,039	71,461	93,628
South Korea
Segment Reporting Information [Line Items]
Product revenues	88,745	63,339	58,717
Germany
Segment Reporting Information [Line Items]
Product revenues	58,536	81,315	88,366
Japan
Segment Reporting Information [Line Items]
Product revenues	57,785	76,197	62,633
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	37,542	38,888	42,665
Other
Segment Reporting Information [Line Items]
Product revenues	191,874	200,168	213,570
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 535,521	$ 531,368	$ 559,579