Income taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Net operating loss carryforwards	$ 190,968	$ 110,724
Tax credit carryforwards	104,319	101,895
Stock-based compensation	3,163	4,531
Allowance for returns	1,098	1,706
Intangible assets	2,536	1,873
Deferred Tax Assets, Property, Plant and Equipment	1,455	1,177
Deferred Tax Assets, Operating lease liabilities	4,532	6,784
Capitalized research and development costs	19,697	80,310
Accruals and reserves	19,361	21,944
Total deferred tax assets	347,129	330,944
Valuation allowance	(344,611)	(327,367)
Total deferred tax assets, net of valuation allowance	2,518	3,577
Deferred Tax Liabilities Operating Lease Liability	(2,635)	(3,424)
Deferred Tax Liabilities, Gross	(2,635)	(3,424)
Deferred Income Tax Assets, Net	$ (117)	$ (153)

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Deferred Tax Assets, Operating lease liabilities

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated returns and sales allowances.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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