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Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Concentration risk
Cash and cash equivalents	$ 86,068	$ 37,747	$ 70,162
Investments - debt securities		40,576
U.S. Treasury Bills
Concentration risk
Investments - debt securities		$ 40,576
Credit concentration risk \| Assets
Concentration risk
Cash amount not insured by FDIC	18,700
Credit concentration risk \| Assets \| Money market fund
Concentration risk
Cash and cash equivalents	1,400
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	$ 59,800