XML 62 R19.htm IDEA: XBRL DOCUMENT v2.4.1.9

Initial Public Offering	12 Months Ended
	Dec. 31, 2014
Initial Public Offering
Initial Public Offering	11. Initial Public Offering On December 2, 2013, we commenced our initial public offering pursuant to a registration statement on Form S‑1 that was declared effective by the SEC on December 3, 2013 and that registered an aggregate of 14,639,500 shares of our common stock for sale to the public at a price of $5.50 per share and an aggregate offering price of $80,517,250. The net offering proceeds to us, after deducting underwriting discounts and commissions and offering costs, were approximately $72.5 million. Deferred offering costs as of December 31, 2013, consisted of legal, accounting, printing and filing fees incurred in the preparation of the Company’s Registration Statement on Form S‑1 as part of the Company’s IPO have been offset against the IPO proceeds upon the completion of the offering in December 2013.

X

- Details

Name:	xncr_InitialPublicOfferingAbstract
Namespace Prefix:	xncr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The entire disclosure of initial public offering made by the company.

+ References

No definition available.

+ Details

Name:	xncr_InitialPublicOfferingDisclosureTextBlock
Namespace Prefix:	xncr_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration