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Marketable Securities
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
Immunomedics considers all of its current investments to be available-for-sale. Marketable securities at June 30, 2020, consisted of the following (in thousands):
 Amortized
Cost		Gross
Unrealized
Gain		Gross
Unrealized
(Loss)		Fair Value
U.S. Government Sponsored Agencies$4,941  $—  $(616) $4,325  
 
        Maturities of debt securities classified as available-for-sale were as follows at June 30, 2020 (in thousands):
 Fair ValueNet Carrying
Amount
Due after one year through five years$4,325  $4,337  
 

        Marketable securities at December 31, 2019 consisted of the following (in thousands):
 Amortized
Cost		Gross
Unrealized
Gain		Gross
Unrealized
(Loss)		Fair Value
U.S. Government Sponsored Agencies$4,941  $—  $(391) $4,550  
 

        Maturities of debt securities classified as available-for-sale were as follows at December 31, 2019 (in thousands):
 Fair ValueNet Carrying
Amount
Due after one year through five years$4,550  $4,562