Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Property and Equipment) (Details)

v2.4.1.9
Basis of Presentation (Property and Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of Property and equipment    
Property and equipment , gross $ 3,081us-gaap_PropertyPlantAndEquipmentGross $ 3,129us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (2,641)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,643)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net 440us-gaap_PropertyPlantAndEquipmentNet 486us-gaap_PropertyPlantAndEquipmentNet
Lab and office equipment    
Summary of Property and equipment    
Property and equipment , gross 2,176us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
2,232us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Leasehold improvements    
Summary of Property and equipment    
Property and equipment , gross 273us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
273us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Computer equipment and software    
Summary of Property and equipment    
Property and equipment , gross $ 632us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= lgnd_ComputerEquipmentAndSoftwareMember
$ 624us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= lgnd_ComputerEquipmentAndSoftwareMember