Income Taxes - Reconciliation of U.S. statutory income tax rate to effective tax rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of the U.S. statutory income tax rate to the Company's effective tax rate
Federal income tax at statutory rate (as a percent)	21.00%	21.00%	21.00%
State income tax benefit, net of federal benefit (as a percent)	0.90%	0.10%	0.20%
Unrealized gain on warrants	9.80%	17.80%	1.10%
Research and development tax credits (as a percent)		0.10%	0.20%
Other (as a percent)	(4.60%)	(5.50%)	(2.20%)
Increase to valuation allowance (as a percent)	(27.10%)	(18.00%)	(20.30%)
Effective income tax rate (as a percent)	0.00%	15.50%	0.00%