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Cash and Cash Equivalents and Investments
 12 Months Ended
Dec. 31, 2022
Cash and Cash Equivalents and Investments [Abstract]  
Cash and Cash Equivalents and Investments Cash, Cash Equivalents and Investments
The fair value of cash and cash equivalents and investments held at December 31, 2022 and 2021 are as follows:

 As of December 31, 2022
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$46,345 $— $— $46,345 
Securities maturing within one year:   
U.S. treasury securities74,022 — (342)73,680 
Corporate debt securities18,418 — (86)18,332 
Total short-term investments$92,440 $— $(428)$92,012 
Total cash and cash equivalents and investments$138,785 $— $(428)$138,357 
 
 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:   
Corporate debt securities26,018 5 (11)26,012 
Total short-term investments$26,018 $5 $(11)$26,012 
Total cash and cash equivalents and investments$90,084 $5 $(12)$90,077 
There were no realized gains or losses for the years ended December 31, 2022, 2021, and 2020.