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Warrants - Additional Information (Details) | Jun. 30, 2020 shares
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Equity [Abstract] |
Warrant exercised | 46,869

X
- Definition Class of warrant or right number of securities called by each warrant or right exercised. + References No definition available. + Details
Name: | pcvx_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRightExercised
Namespace Prefix: | pcvx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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