Capitalization of expenditure net of amortization, amount.

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Amount of research and development tax credit derecognized.

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Amount of current income tax expense (benefit) directly related to operating loss carryforwards and certain tax credits.

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Research and development expenditures amortization period.

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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 operating loss carryforwards that are not subject to expiration dates.

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No definition available.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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No definition available.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income taxes - Textual (Details) - USD ($)	12 Months Ended
Income taxes - Textual (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Income tax benefit related to operating losses and research and development tax credits	$ 0	$ 0	$ 0
Net operating loss carry forwards	88,219,000	68,450,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	12,846,000	7,704,000
Increase (Decrease) in Valuation Allowance	68,371,000	41,837,000	30,626,000
Gross unrecognized tax benefit	3,394,000	2,110,000	$ 1,313,000	$ 644,000
Accrued interest or penalties related to uncertain tax positions	0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	284,344,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	281,900,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	14,379,000
NOL carryforwards that expire	2,118,000
Research and development tax credit derecognized	87,000
Federal \| Research and development expense
Operating Loss Carryforwards [Line Items]
Capitalization of expenditure net of amortization, amount	$ 65,437,000	$ 57,658,000
Foreign \| Research and development expense
Operating Loss Carryforwards [Line Items]
Research and development expenditures amortization period	15 years	15 years
Capitalization of expenditure net of amortization, amount	$ 65,899,000	$ 14,728,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	413,182,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,355,000
NOL carryforwards that expire	3,632,000
Research and development tax credit derecognized	$ 43,000