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Leases - Schedule of Maturities of Lease Liabilities (Parenthetical) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Palo Alto |
Lessee Lease Description [Line Items] |
Lease incentives | $ 0.9

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- Definition Lease Payment Receivable Noncurrent + References No definition available. + Details
Name: | pcvx_LeasePaymentReceivableNoncurrent
Namespace Prefix: | pcvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition 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. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=pcvx_PaloAltoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |