XML 19 R9.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Cash and Cash Equivalents and Investments
 3 Months Ended
Mar. 31, 2024
Cash, Cash Equivalents, and Short-Term Investments [Abstract]  
Cash and Cash Equivalents and Investments Cash and Cash Equivalents and Investments
The fair value of cash and cash equivalents and investments held at March 31, 2024 and December 31, 2023 are as follows: 
 As of March 31, 2024
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
 (in thousands)
Cash and cash equivalents$96,494 $— $— $96,494 
Securities maturing within one year:    
U.S. treasury securities245,145 9 (56)245,098 
Corporate debt securities14,008 3 (5)14,006 
Total short-term investments$259,153 $12 $(61)$259,104 
Total cash and cash equivalents and investments$355,647 $12 $(61)$355,598 
 As of December 31, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
  (in thousands) 
Cash and cash equivalents$22,465 $— $— $22,465 
Securities maturing within one year:    
U.S. treasury securities141,577 31 (12)141,596 
Corporate debt securities5,954 11 — 5,965 
Total short-term investments$147,531 $42 $(12)$147,561 
Total cash and cash equivalents and investments
$169,996 $42 $(12)$170,026 

As of March 31, 2024 and December 31, 2023, our investments in an unrealized loss position had an estimated fair value of $216.0 million and $58.5 million, respectively. There were no realized gains or losses during either of the three month periods ended March 31, 2024 and 2023.