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Fair Value Measurements - Fair Value of Financial Assets Measured on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets:    
Total $ 353,029 $ 330,430
Level 1    
Assets:    
Total 192,437 159,757
Level 2    
Assets:    
Total 160,592 170,673
Money Market Funds    
Assets:    
Total 54,078 36,486
Money Market Funds | Level 1    
Assets:    
Total 54,078 36,486
Commercial Paper    
Assets:    
Total 78,348 87,140
Commercial Paper | Level 2    
Assets:    
Total 78,348 87,140
Corporate Debt Securities    
Assets:    
Total 54,494 36,429
Corporate Debt Securities | Level 2    
Assets:    
Total 54,494 36,429
Equity Securities    
Assets:    
Total 34,043 32,020
Equity Securities | Level 1    
Assets:    
Total 34,043 32,020
Asset-backed Securities    
Assets:    
Total 27,750 14,016
Asset-backed Securities | Level 2    
Assets:    
Total 27,750 14,016
U.S. Government Securities    
Assets:    
Total 104,316 91,251
U.S. Government Securities | Level 1    
Assets:    
Total $ 104,316 91,251
U.S. Agency Securities    
Assets:    
Total   16,607
U.S. Agency Securities | Level 2    
Assets:    
Total   16,607
Supranational Debt Securities    
Assets:    
Total   16,481
Supranational Debt Securities | Level 2    
Assets:    
Total   $ 16,481