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Summary of Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Concentration risk
Cash and cash equivalents	$ 89,768	$ 86,068	$ 57,152
Investments - debt securities	0	$ 0
Credit concentration risk \| Assets \| Money market fund
Concentration risk
Cash and cash equivalents	2,100
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	$ 59,900