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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Cash Equivalents and Marketable Securities
The following table summarizes, by major security type, our restricted cash, cash equivalents, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):
June 30, 2022December 31, 2021
Amortized CostUnrealized GainsUnrealized LossesFair ValueFair Value
Level 1:
Restricted cash:
Restricted cash$10,755 $— $— $10,755 $10,823 
Total restricted cash$10,755 $— $— $10,755 $10,823 
Level 1 securities:
Cash equivalents:
Money market funds$166,174 $— $— $166,174 $73,138 
Total cash equivalents$166,174 $— $— $166,174 $73,138 
Level 2 securities:
Marketable securities:
Commercial paper$127,113 $— $— $127,113 $59,792 
Asset-backed securities28,317 — (90)28,227 40,942 
Corporate bonds208,362 — (3,465)204,897 237,402 
U.S. treasury securities181,344 — (2,164)179,180 272,300 
Supranational bonds53,027 — (969)52,058 70,887 
Total marketable securities$598,163 $— $(6,688)$591,475 $681,323 
Schedule of Cash Equivalents
The following table summarizes, by major security type, our restricted cash, cash equivalents, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):
June 30, 2022December 31, 2021
Amortized CostUnrealized GainsUnrealized LossesFair ValueFair Value
Level 1:
Restricted cash:
Restricted cash$10,755 $— $— $10,755 $10,823 
Total restricted cash$10,755 $— $— $10,755 $10,823 
Level 1 securities:
Cash equivalents:
Money market funds$166,174 $— $— $166,174 $73,138 
Total cash equivalents$166,174 $— $— $166,174 $73,138 
Level 2 securities:
Marketable securities:
Commercial paper$127,113 $— $— $127,113 $59,792 
Asset-backed securities28,317 — (90)28,227 40,942 
Corporate bonds208,362 — (3,465)204,897 237,402 
U.S. treasury securities181,344 — (2,164)179,180 272,300 
Supranational bonds53,027 — (969)52,058 70,887 
Total marketable securities$598,163 $— $(6,688)$591,475 $681,323 
Schedule of Amortized Cost and Fair Value of Our Marketable Securities
The following table summarizes the amortized cost and fair value of our marketable securities as of June 30, 2022, by contractual years to maturity (in thousands):
Amortized CostFair Value
Due within one year$542,211 $537,242 
Due between one and two years55,952 54,233 
Total$598,163 $591,475