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Summary of Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Concentration risk
Cash and cash equivalents	$ 91,998	$ 37,747	$ 18,846
Investments - debt securities	9,975	40,576
U.S. Treasury Bills
Concentration risk
Investments - debt securities	9,975	$ 40,576
Credit concentration risk \| Assets \| Money market fund
Concentration risk
Cash and cash equivalents	1,600
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	48,800
Investments - debt securities	$ 10,000