Summary of significant accounting policies (Policies)	6 Months Ended
Jun. 30, 2024
Summary of significant accounting policies
Use of estimates	Use of estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, revenue recognition, the accrual for research and development expenses and research and development incentives receivable, share-based compensation expense, valuation of right-of-use assets and liabilities and income taxes, including the valuation allowance for deferred tax assets. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. Estimates are periodically reviewed in light of reasonable changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates or assumptions.
Significant risks and uncertainties	Significant risks and uncertainties The Company currently operates in a period of economic uncertainty which has been significantly impacted by domestic and global monetary and fiscal policy, geopolitical conflicts such as the ongoing wars involving Ukraine and Israel, inflation and interest rates, and fluctuations in monetary exchange rates. While the Company has experienced limited financial impacts at this time, the Company continues to monitor these factors and events and the potential effects each may have on the Company’s business, financial condition, results of operations and growth prospects.
Unaudited interim financial information	Unaudited interim financial information Certain information in the footnote disclosures of these financial statements has been condensed or omitted pursuant to the rules and regulations of the SEC. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023 included in the Company’s 2023 Annual Report. The accompanying condensed consolidated balance sheet as of June 30, 2024, the condensed consolidated statements of operations and comprehensive loss, condensed consolidated statements of shareholders’ equity and condensed consolidated statements of cash flows for the three and six months ended June 30, 2024 and 2023, and the related financial information disclosed in these notes are unaudited. The unaudited interim financial statements have been prepared on the same basis as the audited annual financial statements for the year ended December 31, 2023, and, in the opinion of management, reflect all adjustments, consisting of normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of June 30, 2024, the results of its operations and its cash flows for the three and six months ended June 30, 2024 and 2023. The results for the three and six months ended June 30, 2024 are not necessarily indicative of the results to be expected for the year ending December 31, 2024, any other interim periods, or any future year or period.
Research and development incentives and receivable	Research and development incentives and receivable The Company, through its subsidiaries in the United Kingdom, receives reimbursements of certain research and development expenditures as part of a United Kingdom government’s research and development tax reliefs program. Under the Small and Medium-sized Enterprises (“SME”) R&D Tax Relief program, the Company is able to surrender trading losses that arise from qualifying research and development expenses incurred by the Company’s subsidiaries in the United Kingdom for a cash rebate of up to 33.35% of qualifying expenditure incurred prior to April 1, 2023, and up to 18.6% of qualifying expenditure incurred thereafter. Amendments to the U.K. R&D tax credit regime included in Finance Act 2024, which was enacted in February 2024, increased the cash rebate that may be claimed to 26.97% of qualifying expenditure, retroactively applied to qualifying expenditures incurred after April 1, 2023, if we qualify as “R&D intensive” for an accounting period (broadly, a loss making SME whose relevant R&D expenditure represents, for accounting periods beginning on or after April 1, 2023, 40%, or, for accounting periods beginning on or after April 1, 2024, 30%, of its total expenditure for that accounting period). Management has assessed the Company’s research and development activities and expenditures to determine which activities and expenditures are likely to be eligible under the research and development incentive program described above. At each period end, management estimates the reimbursement available to the Company based on available information at the time. The Company recognizes income from the research and development incentives when the relevant expenditure has been incurred, the associated conditions have been satisfied and there is reasonable assurance that the reimbursement will be received. The Company records these research and development incentives as a reduction to research and development expenses in the statements of operations and comprehensive loss, as the research and development tax credits are not dependent on us generating future taxable income, the Company’s ongoing tax status, or tax position. The research and development incentives receivable represent an amount due in connection with the above program. The Company recorded a reduction to research and development expense of $7.3 million and $22.6 million during the three and six months ended June 30, 2024, respectively, including the impact of an increase to U.K. R&D tax credit reimbursement rates enacted with Finance Act 2024 retroactively applied to qualifying expenditures incurred after April 1, 2023. The Company recorded a reduction to research and development expense of $5.7 million and $12.6 million during the three and six months ended June 30, 2023, respectively.
Recently adopted accounting pronouncements and Recently issued accounting pronouncements not yet adopted	Recently adopted accounting pronouncements There have been no recently adopted accounting pronouncements during the three or six months ended June 30, 2024 that are of significance or potential significance to the Company. Recently issued accounting pronouncements not yet adopted In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740) Improvements to Income Tax Disclosures (“ASU No. 2023-09”), which prescribes standard categories for the components of the effective tax rate reconciliation and requires disclosure of additional information for reconciling items meeting certain quantitative thresholds, requires disclosure of disaggregated income taxes paid, and modifies certain other income tax-related disclosures. ASU No. 2023-09 is effective for annual periods beginning after December 15, 2024 and allows for adoption on a prospective basis, with a retrospective option. The Company is currently evaluating the potential impact of the adoption of ASU No. 2023-09 on its consolidated financial statements and related disclosures. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) Improvements to Reportable Segment Disclosures (“ASU No. 2023-07”), which requires disclosure of incremental segment information on an interim and annual basis. ASU No. 2023-07 is effective for annual periods beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024, and requires retrospective adoption to all prior periods presented in the consolidated financial statements. The Company is currently evaluating the potential impact of the adoption of ASU No. 2023-07 on its consolidated financial statements and related disclosures.

Summary of significant accounting policies (Policies)

6 Months Ended

Jun. 30, 2024

Summary of significant accounting policies

The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, revenue recognition, the accrual for research and development expenses and research and development incentives receivable, share-based compensation expense, valuation of right-of-use assets and liabilities and income taxes, including the valuation allowance for deferred tax assets. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. Estimates are periodically reviewed in light of reasonable changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates or assumptions.

Significant risks and uncertainties

The Company currently operates in a period of economic uncertainty which has been significantly impacted by domestic and global monetary and fiscal policy, geopolitical conflicts such as the ongoing wars involving Ukraine and Israel, inflation and interest rates, and fluctuations in monetary exchange rates. While the Company has experienced limited financial impacts at this time, the Company continues to monitor these factors and events and the potential effects each may have on the Company’s business, financial condition, results of operations and growth prospects.

Unaudited interim financial information

Certain information in the footnote disclosures of these financial statements has been condensed or omitted pursuant to the rules and regulations of the SEC. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023 included in the Company’s 2023 Annual Report.

The accompanying condensed consolidated balance sheet as of June 30, 2024, the condensed consolidated statements of operations and comprehensive loss, condensed consolidated statements of shareholders’ equity and condensed consolidated statements of cash flows for the three and six months ended June 30, 2024 and 2023, and the related financial information disclosed in these notes are unaudited. The unaudited interim financial statements have been prepared on the same basis as the audited annual financial statements for the year ended December 31, 2023, and, in the opinion of management, reflect all adjustments, consisting of normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of June 30, 2024, the results of its operations and its cash flows for the three and six months ended June 30, 2024 and 2023. The results for the three and six months ended June 30, 2024 are not necessarily indicative of the results to be expected for the year ending December 31, 2024, any other interim periods, or any future year or period.

Research and development incentives and receivable

The Company, through its subsidiaries in the United Kingdom, receives reimbursements of certain research and development expenditures as part of a United Kingdom government’s research and development tax reliefs program. Under the Small and Medium-sized Enterprises (“SME”) R&D Tax Relief program, the Company is able to surrender trading losses that arise from qualifying research and development expenses incurred by the Company’s subsidiaries in the United Kingdom for a cash rebate of up to 33.35% of qualifying expenditure incurred prior to April 1, 2023, and up to 18.6% of qualifying expenditure incurred thereafter. Amendments to the U.K. R&D tax credit regime included in Finance Act 2024, which was enacted in February 2024, increased the cash rebate that may be claimed to 26.97% of qualifying expenditure, retroactively applied to qualifying expenditures incurred after April 1, 2023, if we qualify as “R&D intensive” for an accounting period (broadly, a loss making SME whose relevant R&D expenditure represents, for accounting periods beginning on or after April 1, 2023, 40%, or, for accounting periods beginning on or after April 1, 2024, 30%, of its total expenditure for that accounting period).

Management has assessed the Company’s research and development activities and expenditures to determine which activities and expenditures are likely to be eligible under the research and development incentive program described above. At each period end, management estimates the reimbursement available to the Company based on available information at the time.

The Company recognizes income from the research and development incentives when the relevant expenditure has been incurred, the associated conditions have been satisfied and there is reasonable assurance that the reimbursement will be received. The Company records these research and development incentives as a reduction to research and development expenses in the statements of operations and comprehensive loss, as the research and development tax credits are not dependent on us generating future taxable income, the Company’s ongoing tax status, or tax position. The research and development incentives receivable represent an amount due in connection with the above program. The Company recorded a reduction to research and development expense of $7.3 million and $22.6 million during the three and six months ended June 30, 2024, respectively, including the impact of an increase to U.K. R&D tax credit reimbursement rates enacted with Finance Act 2024 retroactively applied to qualifying expenditures incurred after

April 1, 2023. The Company recorded a reduction to research and development expense of $5.7 million and $12.6 million during the three and six months ended June 30, 2023, respectively.

Recently adopted accounting pronouncements and Recently issued accounting pronouncements not yet adopted

Recently adopted accounting pronouncements

There have been no recently adopted accounting pronouncements during the three or six months ended June 30, 2024 that are of significance or potential significance to the Company.

Recently issued accounting pronouncements not yet adopted

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740) Improvements to Income Tax Disclosures (“ASU No. 2023-09”), which prescribes standard categories for the components of the effective tax rate reconciliation and requires disclosure of additional information for reconciling items meeting certain quantitative thresholds, requires disclosure of disaggregated income taxes paid, and modifies certain other income tax-related disclosures. ASU No. 2023-09 is effective for annual periods beginning after December 15, 2024 and allows for adoption on a prospective basis, with a retrospective option. The Company is currently evaluating the potential impact of the adoption of ASU No. 2023-09 on its consolidated financial statements and related disclosures.

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) Improvements to Reportable Segment Disclosures (“ASU No. 2023-07”), which requires disclosure of incremental segment information on an interim and annual basis. ASU No. 2023-07 is effective for annual periods beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024, and requires retrospective adoption to all prior periods presented in the consolidated financial statements. The Company is currently evaluating the potential impact of the adoption of ASU No. 2023-07 on its consolidated financial statements and related disclosures.