Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Refunds and other receivables	$ 860	$ 648
Prepaid expenses	3,816	1,889
Deferred financing costs	225	0
Other current assets	208	981
Prepaid expenses and other current assets	$ 5,109	$ 3,518