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Segment Reporting (Summary of Revenues and Long-Lived Assets by Geographic Region) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net revenues | $ 112,198 | $ 83,431 | $ 316,881 | $ 253,925 |
Long-Lived Assets | 271,015 |  | 271,015 |  | $ 280,709
UNITED STATES |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net revenues | 107,829 | 79,407 | 302,192 | 242,370 |
Long-Lived Assets | 134,684 |  | 134,684 |  | 129,401
CHINA |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net revenues | 2,554 | 1,959 | 4,801 | 2,482 |
Long-Lived Assets | 89,385 |  | 89,385 |  | 98,538
FRANCE |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Net revenues | 1,815 | $ 2,065 | 9,888 | $ 9,073 |
Long-Lived Assets | $ 46,946 |  | $ 46,946 |  | $ 52,770

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