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Lease Obligations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Payments expected to received from sublease agreements
Total operating lease obligations	$ 9,043us-gaap_ContractualObligation
Net operating lease obligations	8,145us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Corporate headquarters-San Diego, CA
Payments expected to received from sublease agreements
Lease Termination Date	Jul. 01, 2019
Total operating lease obligations	3,210us-gaap_ContractualObligation / us-gaap_StatementGeographicalAxis = stpr_CA
Bioscience and Technology Business Center-Lawrence, KS
Payments expected to received from sublease agreements
Lease Termination Date	Dec. 01, 2014
Total operating lease obligations	162us-gaap_ContractualObligation / us-gaap_StatementGeographicalAxis = stpr_KS
Vacated office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Lease Termination Date	Jul. 01, 2015
Total operating lease obligations	1,339us-gaap_ContractualObligation / us-gaap_StatementGeographicalAxis = lgnd_CMember
Vacated office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Lease Termination Date	Aug. 01, 2016
Total operating lease obligations	4,332us-gaap_ContractualObligation / us-gaap_StatementGeographicalAxis = stpr_NJ
Office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Lease Termination Date	Jul. 01, 2015
Net operating lease obligations	545us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
Office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Lease Termination Date	Aug. 01, 2016
Net operating lease obligations	353us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilityCranburyMember
Less than 1 year
Payments expected to received from sublease agreements
Total operating lease obligations	4,664us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember
Net operating lease obligations	3,907us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember
Less than 1 year | Corporate headquarters-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	682us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember / us-gaap_StatementGeographicalAxis = stpr_CA
Less than 1 year | Bioscience and Technology Business Center-Lawrence, KS
Payments expected to received from sublease agreements
Total operating lease obligations	54us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember / us-gaap_StatementGeographicalAxis = stpr_KS
Less than 1 year | Vacated office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	1,339us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember / us-gaap_StatementGeographicalAxis = lgnd_CMember
Less than 1 year | Vacated office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Total operating lease obligations	2,589us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember / us-gaap_StatementGeographicalAxis = stpr_NJ
Less than 1 year | Office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Net operating lease obligations	545us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
Less than 1 year | Office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Net operating lease obligations	212us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_LessThan1YearMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilityCranburyMember
1 year
Payments expected to received from sublease agreements
Total operating lease obligations	2,497us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_OneYearMember
Net operating lease obligations	2,356us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_OneYearMember
1 year | Corporate headquarters-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	700us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_OneYearMember / us-gaap_StatementGeographicalAxis = stpr_CA
1 year | Bioscience and Technology Business Center-Lawrence, KS
Payments expected to received from sublease agreements
Total operating lease obligations	54us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_OneYearMember / us-gaap_StatementGeographicalAxis = stpr_KS
1 year | Vacated office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_OneYearMember / us-gaap_StatementGeographicalAxis = lgnd_CMember
1 year | Vacated office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Total operating lease obligations	1,743us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_OneYearMember / us-gaap_StatementGeographicalAxis = stpr_NJ
1 year | Office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Net operating lease obligations	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_OneYearMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
1 year | Office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Net operating lease obligations	141us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_OneYearMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilityCranburyMember
2 years
Payments expected to received from sublease agreements
Total operating lease obligations	772us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember
Net operating lease obligations	772us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember
2 years | Corporate headquarters-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	718us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember / us-gaap_StatementGeographicalAxis = stpr_CA
2 years | Bioscience and Technology Business Center-Lawrence, KS
Payments expected to received from sublease agreements
Total operating lease obligations	54us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember / us-gaap_StatementGeographicalAxis = stpr_KS
2 years | Vacated office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember / us-gaap_StatementGeographicalAxis = lgnd_CMember
2 years | Vacated office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember / us-gaap_StatementGeographicalAxis = stpr_NJ
2 years | Office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Net operating lease obligations	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
2 years | Office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Net operating lease obligations	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_TwoYearsMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilityCranburyMember
3 years
Payments expected to received from sublease agreements
Total operating lease obligations	737us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember
Net operating lease obligations	737us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember
3 years | Corporate headquarters-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	737us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember / us-gaap_StatementGeographicalAxis = stpr_CA
3 years | Bioscience and Technology Business Center-Lawrence, KS
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember / us-gaap_StatementGeographicalAxis = stpr_KS
3 years | Vacated office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember / us-gaap_StatementGeographicalAxis = lgnd_CMember
3 years | Vacated office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember / us-gaap_StatementGeographicalAxis = stpr_NJ
3 years | Office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Net operating lease obligations	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
3 years | Office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Net operating lease obligations	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_ThreeYearsMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilityCranburyMember
4 years
Payments expected to received from sublease agreements
Total operating lease obligations	373us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember
Net operating lease obligations	373us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember
4 years | Corporate headquarters-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	373us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember / us-gaap_StatementGeographicalAxis = stpr_CA
4 years | Bioscience and Technology Business Center-Lawrence, KS
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember / us-gaap_StatementGeographicalAxis = stpr_KS
4 years | Vacated office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember / us-gaap_StatementGeographicalAxis = lgnd_CMember
4 years | Vacated office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Total operating lease obligations	0us-gaap_ContractualObligation / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember / us-gaap_StatementGeographicalAxis = stpr_NJ
4 years | Office and research facility-San Diego, CA
Payments expected to received from sublease agreements
Net operating lease obligations	0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilitySanDiegoMember
4 years | Office and research facility-Cranbury, NJ
Payments expected to received from sublease agreements
Net operating lease obligations	$ 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals / lgnd_LeasePeriodsAxis = lgnd_FourYearsMember / us-gaap_StatementGeographicalAxis = lgnd_OfficeAndResearchFacilityCranburyMember

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

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