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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]  
Summary of the Fair Value of Available-for-sale Marketable Securities

As of June 30, 2019, the Company did not hold any marketable securities. The fair value of available-for-sale marketable securities as of December 31, 2018, is as follows (in thousands):

 

 

 

As of

December 31, 2018

 

 

 

Amortized

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

Losses

 

 

Fair Value

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasury securities

 

$

14,106

 

 

$

-

 

 

$

-

 

 

$

14,106

 

 

 

$

14,106

 

 

$

-

 

 

$

-

 

 

$

14,106