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Income taxes - Schedule of Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 12,025,000 | $ 10,840,000
R&D and ITC credit carryforwards | 396,000 | 403,000
Accrued expenses and other | 267,000 | 381,000
Intangibles | 370,000 | 499,000
Leases | 0 | 8,000
Accounts receivable | 76,000 | 39,000
Stock options | 486,000 | 450,000
Inventory | 279,000 | 427,000
Property, plant and equipment | 578,000 | 650,000
Other | 464,000 | 323,000
Deferred tax assets | 14,941,000 | 14,020,000
Valuation allowance | (14,941,000) | (14,020,000)
Deferred tax assets, net | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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