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Supplemental Data - Statement of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Foreign currency gain (loss) $ 27 $ 71 $ (67)
Loss on sale of capital assets (1,458) (1,851) (1,626)
Other income (expense) 247 (679) (353)
Other expense, net $ (1,184) $ (2,459) $ (2,046)