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v3.19.1

Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Product revenues | $ 257,921 | $ 264,586
Type of Revenue [Extensible List] | 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%
United States |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 118,454 | $ 120,350
United States | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 46.00% | 46.00%
Germany |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 23,210 | $ 22,362
Germany | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 9.00% | 8.00%
Japan |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 18,591 | $ 13,573
Japan | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 7.00% | 5.00%
China |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 15,597 | $ 24,204
China | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 6.00% | 9.00%
South Korea |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 14,978 | $ 13,822
South Korea | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 6.00% | 5.00%
Czech Republic |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 12,142 | $ 11,715
Czech Republic | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 5.00% | 5.00%
Canada |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 10,291 | $ 13,113
Canada | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 4.00% | 5.00%
United Kingdom |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 8,832 | $ 10,845
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 3.00% | 4.00%
Romania |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 6,922 | $ 6,298
Romania | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 3.00% | 2.00%
Other |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 28,904 | $ 28,304
Other | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 11.00% | 11.00%
Non U.S. |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 139,467 | $ 144,236
Non U.S. | Sales Revenue, Net | Geographic Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Total product revenues in percentage | 54.00% | 54.00%

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