XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stock-Based Compensation - Options by exercise price (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 $ / shares shares
Stock options outstanding and exercisable by exercise price |
Stock Options Outstanding, Number of Shares | shares | 5,093,442
Stock Options Outstanding, Remaining Contractual Term | 7 years 7 months 13 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 15.32
Stock Options Exercisable, Number of Shares | shares | 2,558,941
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 11.06
$0.59 - $4.25 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 0.59
Range of Exercise Prices, upper limit (in dollars per share) | $ 4.25
Stock Options Outstanding, Number of Shares | shares | 622,046
Stock Options Outstanding, Remaining Contractual Term | 4 years 9 months 26 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 3.17
Stock Options Exercisable, Number of Shares | shares | 622,046
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 3.17
$9.26 - $13.89 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 9.26
Range of Exercise Prices, upper limit (in dollars per share) | $ 13.89
Stock Options Outstanding, Number of Shares | shares | 1,781,232
Stock Options Outstanding, Remaining Contractual Term | 7 years 3 months 4 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 11.87
Stock Options Exercisable, Number of Shares | shares | 1,205,142
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 11.64
$14.10 – $21.15 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 14.10
Range of Exercise Prices, upper limit (in dollars per share) | $ 21.15
Stock Options Outstanding, Number of Shares | shares | 968,314
Stock Options Outstanding, Remaining Contractual Term | 7 years 4 months 24 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 15.80
Stock Options Exercisable, Number of Shares | shares | 634,199
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 15.68
$21.28 – $26.76 |
Stock options outstanding and exercisable by exercise price |
Range of Exercise Prices, lower limit (in dollars per share) | 21.28
Range of Exercise Prices, upper limit (in dollars per share) | $ 26.76
Stock Options Outstanding, Number of Shares | shares | 1,721,850
Stock Options Outstanding, Remaining Contractual Term | 9 years 1 month 17 days
Stock Options Outstanding, Weighted-Average Exercise Price (in dollars per share) | $ 23.00
Stock Options Exercisable, Number of Shares | shares | 97,554
Stock Options Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 24.13

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=xncr_SharesAuthorizedUnderStockOptionPlansExercisePriceRangeOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=xncr_SharesAuthorizedUnderStockOptionPlansExercisePriceRangeTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=xncr_SharesAuthorizedUnderStockOptionPlansExercisePriceRangeThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=xncr_SharesAuthorizedUnderStockOptionPlansExercisePriceRangeFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |