Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 29, 2024 $ / shares	Mar. 31, 2024 USD ($) $ / shares	Mar. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	May 03, 2024 USD ($)	Dec. 31, 2023 USD ($)
Conversion of Stock [Line Items]
Net loss		$ (21,275)	$ (44,859)
Cash consumed in operations		38,353	(47,241)
Cash and cash equivalents		56,600	$ 50,834			$ 52,882
Available-for-sale securities		$ 18,012				$ 17,398
Forecast
Conversion of Stock [Line Items]
Reduction in minimum required regulatory capital and insurance collateral				$ 12,000
Subsequent Event
Conversion of Stock [Line Items]
Estimated cash savings from workforce reduction					$ 13,000
Subsequent Event | Share-Based Awards
Conversion of Stock [Line Items]
Stock split ratio	0.04
Subsequent Event | Warrants
Conversion of Stock [Line Items]
Stock split ratio	0.04
Class A Common Stock
Conversion of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001
Class A Common Stock | Subsequent Event
Conversion of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	0.04
Class V Common Stock
Conversion of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001
Class V Common Stock | Subsequent Event
Conversion of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	0.04