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Investment in Debt Securities - Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Cost Basis    
Due in one year or less $ 22,600  
Due after one year through five years 0  
Total debt securities - available-for-sale 22,600 $ 141,003
Fair Value    
Due in one year or less 22,678  
Due after one year through five years 0  
Total debt securities - available-for-sale $ 22,678 $ 141,062