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Condensed Consolidated Statements of Operations Unaudited (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Interest income $ 0 $ 98 $ 319 $ 131