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Condensed Consolidated Statements of Operations Unaudited (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Interest income $ 0 $ 295 $ 33 $ 645