Equity Incentive Plan - Stock option activity (Details) - Stock option - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Numbers of Shares
Granted (in shares)	357
Amended and Restated Omnibus Equity Incentive Plan 2014, Omnibus Equity Incentive Plan 2020 and IMGX 2021 Plan
Numbers of Shares
Outstanding at beginning (in shares)	426	176	176
Assumed from IMGX (in shares)	200,652
Granted (in shares)		250
Outstanding at ending (in shares)	201,078	429	426	176
Exercisable (in shares)	201,054	200
Average Exercise Price
Outstanding at beginning (in dollars per share)	$ 6,103.81	$ 15,956.72	$ 15,956.72
Assumed from IMGX (in dollars per share)	0.81
Granted (in dollars per share)		74.60
Outstanding at ending (in dollars per share)	13.74	8,900.40	$ 6,103.81	$ 15,956.72
Exercisable (in dollars per share)	$ 11.99	$ 17,091.40
Remaining Contract Life (Years)
Stock option outstanding, remaining contractual life (Years)	7 years 6 months 21 days	9 years 25 days	8 years 6 months 10 days	8 years 2 months 19 days
Assumed from IMGX (in years)	7 years 6 months 21 days
Granted (in years)		9 years 10 months 28 days
Exercisable (in years)	7 years 6 months 21 days	8 years 4 months 24 days
Assumed from IMGX, intrinsic value	$ 716,328
Exercisable, intrinsic value	716,341
Stock options outstanding, intrinsic value	$ 716,350