Income taxes - Significant components of net deferred tax liability (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Net operating losses	$ 40,255	$ 31,442
Capitalized R&D costs	9,804	7,985
Accruals & reserves	846	934
Intangibles	1,020	817
Interest	5,033	2,788
Stock compensation	2,370	2,272
Inventory	2,233	4,061
Lease liabilities	1,587	2,107
Depreciation	423	312
Other	1,076	778
Gross deferred tax assets	64,647	53,496
Valuation Allowance	(63,073)	(51,359)
Net deferred tax assets	1,574	2,137
Deferred tax liabilities
Goodwill	(563)	(160)
Right of use asset	(1,014)	(1,976)
Net deferred tax asset (liability)	$ (3)
Net deferred tax asset (liability)		$ 1