Share-based Compensation - Restricted Stock Units Activity Under 2023 Incentive Award Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Apr. 19, 2025
Other than options, Weighted Average Exercise Price
Share-based compensation expense	$ 1,000	$ 1,600	$ 4,400	$ 4,900
Common stock reserved	5,538,345		5,538,345		827,586
Incentive Award Plan 2023
Other than options, Weighted Average Exercise Price
Aggregate number of shares available for future grant	40,398		40,398
2025 Employment Inducement Incentive Award Plan
Other than options, Weighted Average Exercise Price
Weighted-average remaining requisite service period for which unrecognized compensation expense			43 months
Options granted			59,034
Exercise price of shares granted			$ 0.41
Weighted average fair value of options granted per share			$ 0.37
Weighted average remaining contractual life of options outstanding			9 years 7 months 6 days
Weighted average remaining contractual life of options exercisable			9 years 7 months 6 days
Unrecognized compensation expense related to non-vested stock options	$ 20		$ 20
2025 Employment Inducement Incentive Award Plan | Class A member
Other than options, Weighted Average Exercise Price
Common stock reserved						1,000,000
Aggregate number of shares available for future grant	660,983		660,983
RSU | Incentive Award Plan 2023
Other than options, Number of Shares
Outstanding, beginning of period			14,215
Outstanding, ending of period	14,215		14,215		14,215
Other than options, Weighted Average Exercise Price
Outstanding, beginning of period			$ 60.05
Outstanding, ending of period	$ 60.05		$ 60.05		$ 60.05
Share-based compensation expense	$ 100		$ 300
Unrecognized compensation expense related to other than options	400		$ 400		$ 700
Weighted-average remaining requisite service period for which unrecognized compensation expense			11 months		20 months
RSU | 2025 Employment Inducement Incentive Award Plan
Other than options, Number of Shares
Granted			279,983
Other than options, Weighted Average Exercise Price
Granted			$ 0.49
Unrecognized compensation expense related to other than options	$ 100		$ 100
Weighted-average remaining requisite service period for which unrecognized compensation expense			43 months
Cash-settled restricted stock units | Incentive Award Plan 2023
Other than options, Number of Shares
Granted	5,288,059		5,288,059
Vested			0
Other than options, Weighted Average Exercise Price
Granted	$ 0.81		$ 0.81
Vested	4 years		4 years
Share-based compensation expense	$ 600		$ 700
Unrecognized compensation expense related to other than options	3,600		$ 3,600
Weighted-average remaining requisite service period for which unrecognized compensation expense			34 months
Cash-settled restricted	$ 700		$ 700