Document and Entity Information Document Information [Table] Class of Stock [Axis] Class of Stock [Domain] Common Stock [Member] Ordinary shares Ordinary Shares Represents the information pertaining to american depositary shares. American Depositary Shares [Member] American Depositary Shares Document Information [Line Items] Document Information Document Type Document Annual Report Document Transition Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Country Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period ICFR Auditor Attestation Flag Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Auditor Name Auditor Firm ID Auditor Location CONSOLIDATED BALANCE SHEETS Statement [Table] This member stands for deferred A shares Deferred A Shares. [Member] Deferred A shares Deferred A Shares Represents information pertaining to deferred B shares. Deferred B Shares [Member] Deferred B shares Deferred B Shares Represents information pertaining to deferred C shares. Deferred C Shares [Member] Deferred C shares Deferred C Shares Statement [Line Items] Statement Assets [Abstract] ASSETS Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable Due from Related Parties, Current Accounts receivable - related parties Amount of research and development incentives receivable. Research and Development Incentives Receivable Research and development incentives receivable Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Total Assets, Current Total current assets Goodwill Ending balance Beginning balance Goodwill Property, Plant and Equipment, Net Property and equipment, net Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Operating Lease, Right-of-Use Asset Right of use assets, net Right-of-use asset Other assets Other assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Liabilities and Other Liabilities, Current Accrued expenses and other current liabilities Total Contract with Customer, Liability, Current Deferred revenue Operating Lease, Liability, Current Operating lease liability - current Lease liability, current Debt, Current Debt Liabilities, Current Total current liabilities Operating Lease, Liability, Noncurrent Operating lease liability Lease liability, noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Contingent consideration Other Liabilities, Noncurrent Other non-current liabilities Amount of classified as non-current liabilities, net value of deferred tax liability. Deferred Tax Liability, Net Deferred tax liability, net Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' equity: Common Stock, Value, Issued Ordinary shares, £0.000025 nominal value; 37,683,531 shares authorized, issued and outstanding (December 31, 2021: authorized, issued and outstanding: 37,188,730) Aggregate par or stated value of issued deferred stock. Deferred Stock, Value Issued Deferred shares Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated other comprehensive loss - foreign currency translation adjustments Stockholders' Equity Attributable to Parent Total shareholders' equity attributable to Vaccitech plc shareholders' Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance at the end Balance at the beginning Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Common Stock, Par or Stated Value Per Share Ordinary shares, nominal value Ordinary shares, nominal value Common Stock, Shares Authorized Ordinary shares, authorized Common Stock, Shares, Issued Ordinary shares, issued Common Stock, Shares, Outstanding Ordinary shares, outstanding Face amount or stated value per share of deferred stock. Deferred Stock, Par Or Stated Value Per Share Deferred shares, nominal value The maximum number of deferred shares permitted to be issued by an entity's charter and bylaws. Deferred Stock, Shares Authorized Deferred shares, authorized Total number of deferred shares of an entity that have been sold or granted to shareholders Deferred Stock, Shares Issued Deferred shares, issued Number of shares of deferred stock outstanding. Deferred Stock, Shares Outstanding Deferred shares, outstanding CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Product and Service [Axis] Product and Service [Domain] License [Member] License revenue Service Revenue [Member] Service revenue Information pertaining to research grants and contracts. Research Grants And Contracts [Member] Research grants and contracts Revenue from Contract with Customer, Excluding Assessed Tax Total revenue Revenue Operating Expenses [Abstract] Operating expenses Research and Development Expense Research and development General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Loss from operations Other Income and Expenses [Abstract] Other income (expense): Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Change in fair value of derivatives embedded in convertible loan notes Change in fair value of derivatives embedded in convertible loan notes Amount before tax of foreign currency transaction unrealized gain (loss) on convertible loan notes recognized in the income statement. Foreign Currency Transaction Gain (Loss), Unrealized On Convertible Loan Notes Unrealized foreign exchange gain on convertible loan notes Unrealized foreign exchange gain on convertible loan notes Gain (Loss) on Extinguishment of Debt Loss on extinguishment of convertible loan notes Loss on extinguishment of convertible loan notes Loss on conversion of convertible notes Investment Income, Interest Interest income Interest Expense Interest expense Represents the research and development incentives (expenses) for the period. Research And Development Incentive Income (Expense) Research and development incentives Recognized research and development incentives Other Nonoperating Income (Expense) Other income, net Nonoperating Income (Expense) Total other income/(expense) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Profit/(loss) before income tax Income Tax Expense (Benefit) Tax benefit Total income tax benefit, current Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) Net income/(loss) Net income/(loss) Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Parent Net income/(loss) attributable to Vaccitech shareholders Weighted Average Number of Shares Outstanding, Basic Weighted-average ordinary shares outstanding, basic Weighted Average Number of Shares Outstanding, Diluted Weighted-average ordinary shares outstanding, diluted Weighted-average ordinary shares outstanding, diluted Earnings Per Share, Basic Net income/(loss) per share attributable to ordinary shareholders, basic Net income/ (loss) per share attributable to ordinary shareholders, basic Earnings Per Share, Diluted Net income/(loss) per share attributable to ordinary shareholders, diluted Net income/ (loss) per share attributable to ordinary shareholders, diluted Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other comprehensive loss - foreign currency translation adjustments Foreign currency translation adjustments Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to Vaccitech plc shareholders Revenue from Related Parties Revenue from related party transactions Revenue from related parties CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED SHARES AND SHAREHOLDERS' EQUITY Description of series A of redeemable convertible preferred stock. Convertible redeemable preferred stock possess conversion and redemption features. The stock has redemption features that are outside the control of the issuer. Series Redeemable Convertible Preferred Stock [Member] Series A shares Series A Redeemable Convertible Preferred Shares Description of series B of redeemable convertible preferred stock. Convertible redeemable preferred stock possess conversion and redemption features. The stock has redemption features that are outside the control of the issuer. Series B Redeemable Convertible Preferred Stock [Member] Series B shares Series B Redeemable Convertible Preferred Shares Equity Components [Axis] Equity Component [Domain] Preferred Stock [Member] Preferred Shares Represents information pertaining to deferred shares. Deferred Shares [Member] Deferred shares Deferred Shares Additional Paid-in Capital [Member] Additional Paid-in-capital Retained Earnings [Member] Accumulated Deficit AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Noncontrolling Interest [Member] Noncontrolling Interest Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity Redeemable Noncontrolling Interest, Equity, Carrying Amount Balance at the end Balance at the beginning Temporary Equity, Shares Outstanding Balance at the end (in shares) Balance at the beginning (in shares) Series B shares outstanding Temporary Equity, Stock Issued During Period, Value, New Issues Issue of shares Series B Shares issued Value of shares issued on conversion of convertible notes during the period classified as temporary equity. Temporary Equity, Value, Conversion Of Convertible Securities Issue of Series B shares, net of issuance costs (in shares) Value of shares issued on conversion of convertible notes during the period classified as temporary equity. Issue Of Series B Shares, Net Of Issuance Costs Issue of Series B shares, net of issuance costs Value of shares issued on conversion of convertible notes during the period classified as temporary equity. Temporary Equity, Shares, Conversion Of Convertible Securities Series B Shares issued on conversion of convertible notes Value of shares issued on conversion of convertible notes during the period classified as temporary equity. Temporary Equity Shares Conversion Of Convertible Securities In Shares Series B Shares issued on conversion of convertible notes (in shares) Value of deferred shares issued during the period from temporary shares. Temporary Equity, Value, Issue Of Deferred shares Issue of Deferred A shares Conversions of Series A shares in equity transactions. Conversion Of Series A Shares Conversion of Series A shares The number of series A shares converted to alternate shares. Conversion Of Series A Shares (In Shares) Conversion of Series A shares (in shares) Conversions of Series B shares in equity transactions. Conversion Of Series B Shares Conversion of Series B shares The number of series B shares converted to alternate shares. Conversion Of Series B Shares (In Shares) Conversion of Series B shares (in shares) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Issued Balance at the end (in shares) Balance at the beginning (in shares) APIC, Share-based Payment Arrangement, Increase for Cost Recognition Share based compensation Amount of increase (decrease) to additional paid in capital (APIC) resulting from measurement period adjustment in business combination. Adjustments to Additional Paid in Capital, Measurement Period Adjustments in Business Combination, Measurement period and contingent consideration adjustments Stock Issued During Period, Value, Other Issue of ordinary shares Stock Issued During Period, Shares, Other Issue of ordinary shares (in shares) Stock Issued During Period, Value, New Issues Value of ordinary shares, issued Initial public offering, net of underwriting discounts Stock Issued During Period, Shares, New Issues Initial public offering, net of underwriting discounts (in shares) Shares issued Offering costs to equity during the period. Offering Costs Offering Cost Conversion of series A shares to regular equity. Conversion Of Series A Shares Equity Conversion of Series A shares Conversion of Series A shares to equity, in shares. Conversion Of Series A Shares Equity (In Shares) Conversion of Series A shares (in shares) Conversion of series B shares to regular equity. Conversion Of Series B Shares Equity Conversion of Series B shares Conversion of Series B shares to equity, in shares. Conversion Of Series B Shares, Equity, In Shares Conversion of Series B shares (in shares) Value of deferred shares issued during the period from temporary shares. Stock Issued During Period, Value, Issue Of Deferred shares Issue of Deferred shares Number of deferred shares issued during the period from temporary shares. Stock Issued During Period, Shares, Issue Of Deferred shares Issue of Deferred shares (in shares) The increase (decrease) in equity attributable to noncontrolling interest. Contributions from noncontrolling interest Contributions from noncontrolling interest Issue of shares to Non-controlling interest Stock Issued During Period, Shares, Acquisitions Business acquisition, Number of shares issued Issue of shares on acquisition of subsidiary (in shares) Stock Issued During Period, Value, Acquisitions Issue of shares on acquisition of subsidiary CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Share-based Payment Arrangement, Noncash Expense Share based compensation Depreciation, Depletion and Amortization Depreciation and amortization The amount of non-cash lease expenses. Non-Cash Lease Expenses Non-cash lease expenses Foreign Currency Transaction Gain (Loss), Unrealized Non-cash gain on foreign currency remeasurement and other non-cash adjustments Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in contingent consideration Amount of non-cash interest expense on convertible loan notes. Non-Cash Interest Expense On Convertible Loan Notes Non cash interest expense Deferred Income Tax Expense (Benefit) Deferred tax expense Gain (Loss) on Disposition of Property Plant Equipment Profit on sale of property and equipment Profit on sale of property plant and equipment Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable (including related parties) Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Amount of increase (decrease) in research and development incentives receivable. Increase (Decrease) in Research and Development Incentives Receivable Research and development incentives receivable Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other current liabilities Increase (Decrease) in Contract with Customer, Liability Deferred revenue Increase (Decrease) in Other Operating Assets Other assets Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Payments to Acquire Businesses, Net of Cash Acquired Acquisition of subsidiary, net of cash acquired Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property plant and equipment Proceeds from sale of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment