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Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Product revenues	$ 267,657	$ 288,535
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United States
Segment Reporting Information [Line Items]
Product revenues	$ 104,122	$ 115,287
China
Segment Reporting Information [Line Items]
Product revenues	38,353	33,515
South Korea
Segment Reporting Information [Line Items]
Product revenues	21,175	24,640
Germany
Segment Reporting Information [Line Items]
Product revenues	19,786	19,180
Romania
Segment Reporting Information [Line Items]
Product revenues	12,755	15,085
Japan
Segment Reporting Information [Line Items]
Product revenues	11,816	17,920
Other
Segment Reporting Information [Line Items]
Product revenues	59,650	62,908
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 163,535	$ 173,248

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