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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 243,384 | $ 259,540 | $ 797,924 | $ 624,214
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 96,683 | $ 111,189 | $ 314,144 | $ 264,204
Germany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 16,011 | 14,553 | 51,541 | 41,144
South Korea |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 20,894 | 23,260 | 71,050 | 60,062
Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 17,054 | 15,280 | 52,607 | 40,766
China |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 32,198 | 27,363 | 99,570 | 63,883
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 60,544 | 67,895 | 209,012 | 154,155
Non U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 146,701 | $ 148,351 | $ 483,780 | $ 360,010

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