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Marketable Securities
12 Months Ended
Dec. 31, 2021
Marketable Securities  
Marketable Securities

4. Marketable Securities

The following table summarizes the Company’s investments as of December 31, 2021 (in thousands):

Gross

Amortized

Unrealized

Estimated

    

Cost

    

Gains

    

Losses

    

Fair Value

Marketable securities available-for-sale:

  

  

  

U.S. Treasury obligations

$

40,194

(35)

$

40,159

Total available-for-sale securities

$

40,194

$

$

(35)

$

40,159

The following table summarizes the Company’s investments as of December 31, 2020 (in thousands):

Gross

Amortized

Unrealized

Estimated

    

Cost

    

Gains

    

Losses

    

Fair Value

Marketable securities available-for-sale:

U.S. Treasury obligations

$

180,675

$

7

$

(9)

$

180,673

Total available-for-sale securities

$

180,675

$

7

$

(9)

$

180,673

The aggregate fair value of marketable securities with unrealized losses was $30.2 million and $45.7 million at December 31, 2021 and 2020, respectively. At December 31, 2021 and 2020, 3 investments and 5 investments, respectively, were in an unrealized loss position. All such investments have been in an unrealized loss position for less than a year and these losses are considered temporary. The Company has the ability and intent to hold these investments until a recovery of their amortized cost, which may not occur until maturity.