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Related Parties (Details)	Sep. 04, 2013 USD ($)
Related Parties
Waiver of debt availed by CEO	$ 166,000

X

- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reprents the amount of waiver granted by the board of directors of outstanding principal and interest under the promissory notes.

+ References

No definition available.

+ Details

Name:	xncr_WaiverOfRelatedPartyDebt
Namespace Prefix:	xncr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration