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Marketable Securities (Details 2)
$ in Thousands
Dec. 31, 2019
USD ($)
Amortized cost $ 5,487
Unrealized, Gains 1
Unrealized, Losses
Market value 5,488
Marketable Securities Due Within One Year [Member]  
Amortized cost 5,487
Unrealized, Gains 1
Unrealized, Losses
Market value $ 5,488