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Cash and Cash Equivalents and Investments
 3 Months Ended
Mar. 31, 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 March 31, 2022 and December 31, 2021 are as follows: 
 As of March 31, 2022
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (in thousands)
Cash and cash equivalents$59,520 $— $— $59,520 
Securities maturing within one year:    
U.S. treasury securities12,486 — (26)12,460 
Corporate debt securities14,533 4 (15)14,522 
Total short-term investments$27,019 $4 $(41)$26,982 
Total cash and cash equivalents and investments$86,539 $4 $(41)$86,502 
 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 three months ended March 31, 2022 and 2021, respectively. The cost of securities sold is based on the specific identification method.