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Financial Instruments - Cash Equivalents, Restricted Cash and Investments, Classified as Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 491,306 $ 535,809
Unrealized Gains 3 30
Unrealized Losses (1,970) (9,512)
Cash equivalents 60,910 11,760
Short-term investments 396,259 455,416
Long-term investments 32,170 59,151
Total cash equivalents and investments 489,339 526,327
Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 50,937 10,679
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 50,937 10,679
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   4,956
Unrealized Gains   0
Unrealized Losses   (2)
Fair Value   4,954
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 86,734 156,019
Unrealized Gains 3 25
Unrealized Losses (558) (2,788)
Fair Value 86,179 153,256
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 311,637 323,077
Unrealized Gains 0 5
Unrealized Losses (680) (5,060)
Fair Value 310,957 318,022
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 41,998 41,078
Unrealized Gains 0 0
Unrealized Losses (732) (1,662)
Fair Value $ 41,266 $ 39,416