XML 33 R47.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Related Parties (Details) (USD $) | 0 Months Ended
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Sep. 04, 2013
Related Parties |
Waiver of debt availed by CEO | $ 166,000 xncr_WaiverOfRelatedPartyDebt

X
- 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