Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Product revenues	$ 288,535	$ 228,613
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
United States
Segment Reporting Information [Line Items]
Product revenues	$ 115,287	$ 105,918
Germany
Segment Reporting Information [Line Items]
Product revenues	19,180	16,830
South Korea
Segment Reporting Information [Line Items]
Product revenues	24,640	16,417
Japan
Segment Reporting Information [Line Items]
Product revenues	17,920	16,137
China
Segment Reporting Information [Line Items]
Product revenues	33,515	13,003
Other
Segment Reporting Information [Line Items]
Product revenues	77,993	60,308
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 173,248	$ 122,695