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Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Nov. 13, 2023	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total (in shares)			12,310,266		12,310,266
Stock‑based compensation expense			$ 3,279	$ 1,591	$ 5,787	$ 3,022
Plan modification, stock-based compensation expense			$ 700		$ 700
Weighted average grant date fair value of stock options (in dollars per share)			$ 9.32	$ 17.40	$ 13.56	$ 16.05
Outstanding Series A Preferred Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total (in shares)			2,496,722		2,496,722
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting term					4 years
Weighted average period					2 years 9 months 18 days
Granted (in shares)					256,790
Granted (in dollars per share)					$ 16.93
Estimated forfeitures rate					10.00%
Unrecognized compensation expense			$ 6,600		$ 6,600
Common stock \| Outstanding Series A Preferred Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested employee stock options			$ 15,600		$ 15,600
Weighted average period					3 years
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants (in shares)												40,341
Number of shares authorized, increase (in shares)	1,030,694	3,466,544
Total (in shares)			3,582,706		3,582,706
Employment Inducement Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants (in shares)			458,737		458,737
Total (in shares)		360,000		360,000		360,000	450,000	60,833		66,667	39,166
Old Cartesian Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants (in shares)			36,179		36,179
Award vesting term					4 years
Award expiration term					10 years
Unrecognized compensation expense related to unvested employee stock options									$ 2,600
Stock‑based compensation expense			$ 200	$ 300	$ 400	$ 700
Old Cartesian Plan \| Old Cartestian \| Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares)									776,865
Old Cartesian Plan \| Old Cartestian \| Preferred stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares)									14,112.299