Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Fair Value of Financial Assets Measured on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Assets:    
Total $ 275,125,000 $ 330,430,000
Level 1    
Assets:    
Total 165,564,000 159,757,000
Level 2    
Assets:    
Total 109,561,000 170,673,000
Level 3    
Assets:    
Total 0 0
Money Market Funds    
Assets:    
Total 46,137,000 36,486,000
Money Market Funds | Level 1    
Assets:    
Total 46,137,000 36,486,000
Commercial Paper    
Assets:    
Total 73,834,000 87,140,000
Commercial Paper | Level 2    
Assets:    
Total 73,834,000 87,140,000
Corporate Debt Securities    
Assets:    
Total 17,863,000 36,429,000
Corporate Debt Securities | Level 2    
Assets:    
Total 17,863,000 36,429,000
Equity Securities    
Assets:    
Total 25,028,000 32,020,000
Equity Securities | Level 1    
Assets:    
Total 25,028,000 32,020,000
Asset-backed Securities    
Assets:    
Total 6,562,000 14,016,000
Asset-backed Securities | Level 2    
Assets:    
Total 6,562,000 14,016,000
U.S. Government Securities    
Assets:    
Total 94,399,000 91,251,000
U.S. Government Securities | Level 1    
Assets:    
Total 94,399,000 91,251,000
U.S. Agency Securities    
Assets:    
Total 6,750,000 16,607,000
U.S. Agency Securities | Level 2    
Assets:    
Total 6,750,000 16,607,000
Supranational Debt Securities    
Assets:    
Total 4,552,000 16,481,000
Supranational Debt Securities | Level 2    
Assets:    
Total $ 4,552,000 $ 16,481,000