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Cash, Cash Equivalents and Marketable Securities
 3 Months Ended
Mar. 31, 2024
Cash and Cash Equivalents [Abstract]  
Cash, Cash Equivalents and Marketable Securities Cash, Cash Equivalents and Marketable Securities
The Company held restricted cash of $1.2 million as of March 31, 2024 as collateral to its corporate credit card program. The Company had no restricted cash as of December 31, 2023. Restricted cash is included within the cash and cash equivalents balance on the Consolidated Balance Sheet.
A summary of cash, cash equivalents and available-for-sale marketable securities held by the Company as of March 31, 2024 and December 31, 2023 is as follows (in thousands):
March 31, 2024
Cost
Unrealized
gains
Unrealized
losses
Fair
value
Cash and cash equivalents:
Cash (Level 1)$3,094 $— $— $3,094 
Money market funds (Level 1)604,553 — — 604,553 
Corporate debt securities due within 3 months of date of purchase (Level 2)
14,870 — — 14,870 
Total cash and cash equivalents622,517 — — 622,517 
Marketable securities:
Corporate debt securities due within 1 year of date of purchase (Level 2)
260,811 32 (140)260,703 
U.S. government and government sponsored entities due within 1 year of date of purchase (Level 2)
175,907 25 (89)175,843 
Total cash, cash equivalents and marketable securities$1,059,235 $57 $(229)$1,059,063 
December 31, 2023
Cost
Unrealized
gains
Unrealized
losses
Fair
value
Cash and cash equivalents:
Cash (Level 1)$2,729 $— $— $2,729 
Money market funds (Level 1)78,555 — — 78,555 
US government and government sponsored entities (Level 1)
14,967 — — 14,967 
Corporate debt securities due within 3 months of date of purchase (Level 2)
3,664 — — 3,664 
Total cash and cash equivalents99,915 — — 99,915 
Marketable securities:
Corporate debt securities due within 1 year of date of purchase (Level 2)382,028 195 (7)382,216 
US government and government sponsored entities due within 1 year of date of purchase (Level 2)
150,743 280 (1)151,022 
Corporate debt securities due within 1 to 2 years of date of purchase (Level 2)
977 1 — 978 
Total cash, cash equivalents and marketable securities$633,663 $476 $(8)$634,131