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Cash and Investments - Investments by Security Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt securities available-for-sale:    
Amortized Cost $ 1,831,896 $ 1,534,464
Gross Unrealized Gains 0 934
Gross Unrealized Losses (22,328) (1,730)
Fair Value 1,809,568 1,533,668
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Amortized Cost 2,122,537 1,855,704
Gross Unrealized Gains 0 934
Gross Unrealized Losses (22,328) (1,730)
Fair Value 2,100,209 1,854,908
Commercial paper    
Debt securities available-for-sale:    
Amortized Cost 874,220 945,801
Gross Unrealized Gains 0 42
Gross Unrealized Losses (364) (2)
Fair Value 873,856 945,841
Corporate bonds    
Debt securities available-for-sale:    
Amortized Cost 633,617 541,774
Gross Unrealized Gains 0 876
Gross Unrealized Losses (15,495) (1,672)
Fair Value 618,122 540,978
U.S. Treasury and government-sponsored enterprises    
Debt securities available-for-sale:    
Amortized Cost 307,494 33,965
Gross Unrealized Gains 0 1
Gross Unrealized Losses (6,157) (21)
Fair Value 301,337 33,945
Municipal bonds    
Debt securities available-for-sale:    
Amortized Cost 16,565 12,924
Gross Unrealized Gains 0 15
Gross Unrealized Losses (312) (35)
Fair Value 16,253 12,904
Cash    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Amortized Cost 113,492 135,653
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 113,492 135,653
Money market funds    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Amortized Cost 62,968 66,531
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 62,968 66,531
Certificates of deposit    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Amortized Cost 114,181 119,056
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 114,181 $ 119,056