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Company Operations by Product, Customer and Geographic Area - Data by Geographic Region (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue by Geographic Region:      
Total revenues $ 22,334 $ 59,215 $ 103,269
Long-lived Assets by Geographic Region:      
Long-lived assets 26,482 29,694 35,154
U.S.      
Revenue by Geographic Region:      
Total revenues 22,334 59,215 101,423
Long-lived Assets by Geographic Region:      
Long-lived assets 20,424 22,254 27,761
France      
Long-lived Assets by Geographic Region:      
Long-lived assets 11 196 1,365
Ireland      
Revenue by Geographic Region:      
Total revenues 0 0 1,846
Long-lived Assets by Geographic Region:      
Long-lived assets $ 6,047 $ 7,244 $ 6,028