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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