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Cash and Cash Equivalents and Investments
 9 Months Ended
Sep. 30, 2022
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents Disclosure Cash and Cash Equivalents and Investments
 
The fair value of cash and cash equivalents and investments held at September 30, 2022 and December 31, 2021 are as follows: 
 As of September 30, 2022
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (in thousands)
Cash and cash equivalents$18,834 $— $— $18,834 
Securities maturing within one year:    
U.S. treasury securities97,984 — (385)97,599 
Corporate debt securities19,876 1 (107)19,770 
Total short-term investments$117,860 $1 $(492)$117,369 
Total cash and cash equivalents and investments$136,694 $1 $(492)$136,203 
 As of December 31, 2021
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$64,066 $— $(1)$64,065 
Securities maturing within one year:    
U.S. treasury securities7,562 — (1)7,561 
Corporate debt securities15,125 — (8)15,117 
Total short-term investments$22,687 $— $(9)$22,678 
Total cash and cash equivalents and investments
$86,753 $— $(10)$86,743 

There were no realized losses during either of the nine months ended September 30, 2022 and 2021, respectively. The cost of securities sold is based on the specific identification method.