Stock-Based Compensation - Stock option activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
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)	(872,873)
Outstanding at end of period (in shares)	7,823,478	4,960,553
Exercisable at end of period (in shares)	2,768,685
Weighted Average Exercise Price
Outstanding (in dollars per share) | $ / shares	$ 5.66	$ 8.04
Granted (in dollars per share) | $ / shares	2.75
Exercised (in dollars per share) | $ / shares	2.82
Cancelled/forfeited (in dollars per share) | $ / shares	6.77
Exercisable at end of period (in dollars per share) | $ / shares	$ 7.19
Weighted Average Remaining Contractual Term (In years)
Outstanding (in years)	8 years 6 months 14 days	8 years 7 months 2 days
Exercisable at end of period (in years)	7 years 7 months 28 days
Aggregate Intrinsic Value
Outstanding (in dollars) | $		$ 89