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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of marketable securities
Marketable securities at March 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

 
$

 
$
(200
)
 
$
4,741

Marketable securities at December 31, 2018 consisted of the following (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
(Loss)
 
Fair Value
U.S. Government Sponsored Agencies
$
4,941

 
$

 
$

 
$
4,941

Schedule of maturities of available-for-sale debt securities
Maturities of debt securities classified as available-for-sale were as follows at March 31, 2019 (in thousands):
 
Fair Value
 
Net Carrying
Amount
Due after one year through five years
$
4,741

 
$
4,754

Maturities of debt securities classified as available-for-sale were as follows at December 31, 2018 (in thousands):
 
Fair Value
 
Net Carrying
Amount
Due after one year through five years
$
4,941

 
$
4,954