Investment in Debt Securities - Cost Basis and Fair Value of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Total debt securities - available-for-sale	$ 22,600	$ 141,003
Unrealized Gains/(Losses), net	78	59
Fair Value	22,678	141,062
U.S. treasury bonds
Debt Securities, Available-for-Sale [Line Items]
Total debt securities - available-for-sale	22,600	141,003
Unrealized Gains/(Losses), net	78	59
Fair Value	$ 22,678	$ 141,062