Stock-Based Compensation - Stock option activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Options Outstanding
Outstanding at beginning of period (in shares)	4,960,553
Granted (in shares)	3,738,555
Exercised (in shares)	(2,757)
Cancelled/forfeited (in shares)	(1,240,556)
Outstanding at end of period (in shares)	7,455,795	4,960,553
Exercisable at end of period (in shares)	3,103,732
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 5.52	$ 8.04
Granted (in dollars per share)	2.75
Exercised (in dollars per share)	2.82
Cancelled/forfeited (in dollars per share)	7.26
Outstanding at end of period (in dollars per share)	5.52	$ 8.04
Exercisable at end of period (in dollars per share)	$ 7.04
Weighted Average Remaining Contractual Term (In years)
Outstanding (in years)	8 years	8 years 7 months 6 days
Exercisable at end of period (in years)	6 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding (in dollars)		$ 89