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Subsequent Events - Additional Information (Details) - Subsequent Event - Underwritten Public Offering - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended
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Feb. 28, 2022 | Jan. 31, 2022
Subsequent Event [Line Items] |  |
Shares issued |  | 2,500,000
Common stock price per share |  | $ 20.00
Pre-funded warrants to purchase shares |  | 2,500,000
Pre-funded warrants price per share |  | $ 19.999
Net proceeds from follow on offering | $ 14.1 | $ 93.5
Underwriters' option to purchase additional shares | 750,000 |

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- Definition Prefunded warrants price per share. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Proceeds from issuance follow on offering. + References No definition available. + Details
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Namespace Prefix: | pcvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Shares issued price per share upon follow on offering. + References No definition available. + Details
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Namespace Prefix: | pcvx_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Shares issued upon follow on offering full exercise of underwriters option to purchase additional shares. + References No definition available. + Details
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Namespace Prefix: | pcvx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Shares pre-funded warrants to purchase. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Stock issued during period, shares of follow on offering. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |