Income taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets related to:
Net operating loss carryforwards	$ 37,443	$ 39,079
Capital loss carryforward	3,164	7,011
Tax credit carryforward	2,801	2,695
Stock-based compensation	1,498	2,141
Accruals and reserves	1,566	1,883
Inventory	1,111	1,410
Fixed assets	(143)	568
Lease liabilities	3,219	3,540
Capitalized research and development	2,540	3,222
Fair value change in investments	314	556
Other	28	1,084
Total deferred tax assets	53,541	63,189
Deferred tax liabilities related to:
Intangibles	(1,108)	(2,326)
Right-of-use assets	(1,863)	(2,654)
Total deferred tax liabilities	(2,971)	(4,980)
Net deferred tax assets before valuation allowance	50,570	58,209
Less: valuation allowance	50,759	58,333	$ 49,517
Net deferred tax liabilities	$ (189)	$ (124)