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Marketable Equity Securities (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]        
Unrealized loss on marketable securities $ 484 $ (63) $ 251 $ (389)
Realized gain on marketable equities securities sold 0 0 25 0
Net loss on marketable securities $ 484 $ (63) $ 276 $ (389)