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Warrants - Additional Information (Details)	Jun. 30, 2020 shares
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