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Organization and Significant Accounting Policies - Investments in Marketable Securities (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Organization and Summary of Significant Accounting Policies      
Interest income from marketable securities $ 2,800,000 $ 1,900,000 $ 1,400,000
Impairments related to credit losses $ 0 $ 0 $ 0