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Stock-based compensation - Equity Incentive Plan (Details) - USD ($) $ in Millions					1 Months Ended			3 Months Ended
	Jan. 01, 2026	Jan. 01, 2025	Jan. 01, 2024	Jul. 13, 2023	May 31, 2026	Apr. 30, 2026	Feb. 28, 2025	Jun. 30, 2026	Mar. 31, 2024
Stock-based compensation
Share Based Compensation Modification Incremental Compensation Cost								$ 1.6
Series A Common Stock
Stock-based compensation
Available for grant (in shares)								844,174
2023 Equity incentive plan \| Series A Common Stock
Stock-based compensation
Common stock reserved for future issuance (in shares)				2,585,968				5,946,142
Annual increase in reserved shares (as a percent)				4.00%
Increase in future issuance (in shares)	1,278,164	1,226,994	855,016
Available for grant (in shares)								141,151
Contractual term				10 years
2024 Inducement Grants \| Series A Common Stock
Stock-based compensation
Common stock reserved for future issuance (in shares)							1,925,000		1,000,000
Increase in future issuance (in shares)					525,000	100,000	300,000
Available for grant (in shares)								677,558