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Marketable Securities
 6 Months Ended
Jun. 30, 2020
Marketable Securities  
Marketable Securities

4.  Marketable Securities

        The following is a summary of marketable securities, classified as available-for-sale:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gross Unrealized

 

 

 

 

Amortized

 

 

 

 

 

 

 

Fair

 

Cost

 

Gains

    

 

Losses

 

 

Value

June 30, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. government obligations (maturing in one year or less)

$

4,073

 

$

 —

 

$

 —

 

$

4,073

Corporate debt securities (maturing in one year or less)

 

43,706

 

 

10

 

 

 

 

 

43,716

Total marketable securities

$

47,779

 

$

10

 

$

 —

 

$

47,789

 

         The Company holds investment-grade marketable securities, and none were in a continuous unrealized loss position for more than twelve months as of June 30, 2020.  Marketable securities include $0.2 million of accrued interest at June 30, 2020.