Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details)

v3.23.1
Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Assets:    
Total $ 330,430,000 $ 265,750,000
Level 1    
Assets:    
Total 159,757,000 114,052,000
Level 2    
Assets:    
Total 170,673,000 151,698,000
Level 3    
Assets:    
Total 0 0
Money Market Funds    
Assets:    
Total 36,486,000 29,451,000
Money Market Funds | Level 1    
Assets:    
Total 36,486,000 29,451,000
Commercial Paper    
Assets:    
Total 87,140,000 22,580,000
Commercial Paper | Level 2    
Assets:    
Total 87,140,000 22,580,000
Corporate Debt Securities    
Assets:    
Total 36,429,000 74,861,000
Corporate Debt Securities | Level 2    
Assets:    
Total 36,429,000 74,861,000
Equity Securities    
Assets:    
Total 32,020,000 37,181,000
Equity Securities | Level 1    
Assets:    
Total 32,020,000 37,181,000
Asset-backed Securities    
Assets:    
Total 14,016,000 32,957,000
Asset-backed Securities | Level 2    
Assets:    
Total 14,016,000 32,957,000
U.S. Government Securities    
Assets:    
Total 91,251,000 47,420,000
U.S. Government Securities | Level 1    
Assets:    
Total 91,251,000 47,420,000
U.S. agency securities    
Assets:    
Total 16,607,000  
U.S. agency securities | Level 2    
Assets:    
Total 16,607,000  
Supranational Debt Securities    
Assets:    
Total 16,481,000 21,300,000
Supranational Debt Securities | Level 2    
Assets:    
Total $ 16,481,000 $ 21,300,000