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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments Debt And Equity Securities [Abstract]  
Summary of Marketable Securities The following table summarizes the marketable securities (in thousands):

 

As of December 31, 2020

 

Amortized
Cost

 

 

Unrealized
Gains

 

 

Unrealized
Losses

 

 

Fair
Value

 

U.S. treasury securities

 

$

10,003

 

 

$

3

 

 

$

—

 

 

$

10,006

 

Corporate notes

 

 

14,522

 

 

 

50

 

 

 

—

 

 

 

14,572

 

Total marketable securities, current

 

$

24,525

 

 

$

53

 

 

$

—

 

 

$

24,578