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Comprehensive Loss - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders' Equity Note [Abstract]        
Unrealized gain (loss) on marketable securities, tax $ (59) $ 1 $ (220) $ 131