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Cash and Cash Equivalents and Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]  
Summary of Cash and Cash Equivalents and Marketable Securities

As of December 31, 2021 and 2020, cash and cash equivalents and marketable securities were comprised of the following:

 

 

 

Amortized Cost

 

 

Unrealized Gains

 

 

Unrealized Losses

 

 

Fair Value

 

 

 

(in thousands)

 

As at December 31, 2021

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds included in cash and
    cash equivalents

 

$

2,535

 

 

$

—

 

 

$

—

 

 

$

2,535

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 U.S. Treasury notes

 

 

7,439

 

 

 

—

 

 

 

—

 

 

 

7,439

 

 Total

 

$

9,974

 

 

$

—

 

 

$

—

 

 

$

9,974

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As at December 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

Money market funds included in cash and
    cash equivalents

 

$

2,455

 

 

$

—

 

 

$

—

 

 

$

2,455

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 U.S. Treasury notes

 

 

7,526

 

 

 

—

 

 

 

—

 

 

 

7,526

 

 Total

 

$

9,981

 

 

$

—

 

 

$

—

 

 

$

9,981