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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amounts computed at statutory federal rate |  |  |  |  |  |  |  |  | $ (3,843)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (3,131)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 1,317us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes net of federal benefit |  |  |  |  |  |  |  |  | (697)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (293)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 196us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Meals & entertainment |  |  |  |  |  |  |  |  | (9)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | (10)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | (8)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Acquisition related transaction costs |  |  |  |  |  |  |  |  | 0lgnd_IncomeTaxReconciliationNondeductibleExpenseAcquisitionRelatedTransactionCosts | 0lgnd_IncomeTaxReconciliationNondeductibleExpenseAcquisitionRelatedTransactionCosts | 0lgnd_IncomeTaxReconciliationNondeductibleExpenseAcquisitionRelatedTransactionCosts
Imputed interest |  |  |  |  |  |  |  |  | (53)lgnd_IncomeTaxReconciliationNondeductibleExpenseInputedInterest | (285)lgnd_IncomeTaxReconciliationNondeductibleExpenseInputedInterest | (259)lgnd_IncomeTaxReconciliationNondeductibleExpenseInputedInterest
Section 162(m) limitation |  |  |  |  |  |  |  |  | (490)lgnd_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount |  |
Contingent liabilities |  |  |  |  |  |  |  |  | (1,748)lgnd_IncomeTaxReconciliationContingentValueRights | (2,027)lgnd_IncomeTaxReconciliationContingentValueRights | 695lgnd_IncomeTaxReconciliationContingentValueRights
Stock-based compensation |  |  |  |  |  |  |  |  | (89)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 556us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 581us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Expired NOLs |  |  |  |  |  |  |  |  | (88)lgnd_IncomeTaxReconciliationExpiredNetOperatingLoss | 0lgnd_IncomeTaxReconciliationExpiredNetOperatingLoss | (6,847)lgnd_IncomeTaxReconciliationExpiredNetOperatingLoss
Research and development credits |  |  |  |  |  |  |  |  | 113lgnd_IncomeTaxReconciliationExpiredTaxCreditsResearch | 4,581lgnd_IncomeTaxReconciliationExpiredTaxCreditsResearch | (1,984)lgnd_IncomeTaxReconciliationExpiredTaxCreditsResearch
Change in uncertain tax positions |  |  |  |  |  |  |  |  | (7)lgnd_IncomeTaxReconciliationChangeInUncertainTaxPositions | (364)lgnd_IncomeTaxReconciliationChangeInUncertainTaxPositions | 830lgnd_IncomeTaxReconciliationChangeInUncertainTaxPositions
Rate change for changes in state law |  |  |  |  |  |  |  |  | (119)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (901)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (3,388)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Increase in deferred tax assets from completion of 382 analysis |  |  |  |  |  |  |  |  | (43)lgnd_IncomeTaxReconciliationChangeInDeferredTaxAssetFrom382Analysis | (786)lgnd_IncomeTaxReconciliationChangeInDeferredTaxAssetFrom382Analysis | 53,257lgnd_IncomeTaxReconciliationChangeInDeferredTaxAssetFrom382Analysis
Change in valuation allowance |  |  |  |  |  |  |  |  | 7,243us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 3,509us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (41,768)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other |  |  |  |  |  |  |  |  | (580)us-gaap_IncomeTaxReconciliationOtherAdjustments | (1,223)us-gaap_IncomeTaxReconciliationOtherAdjustments | (1,431)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense from continuing operations | $ (280)us-gaap_IncomeTaxExpenseBenefit | $ (124)us-gaap_IncomeTaxExpenseBenefit | $ 47us-gaap_IncomeTaxExpenseBenefit | $ (53)us-gaap_IncomeTaxExpenseBenefit | $ (138)us-gaap_IncomeTaxExpenseBenefit | $ (60)us-gaap_IncomeTaxExpenseBenefit | $ (110)us-gaap_IncomeTaxExpenseBenefit | $ (66)us-gaap_IncomeTaxExpenseBenefit | $ (410)us-gaap_IncomeTaxExpenseBenefit | $ (374)us-gaap_IncomeTaxExpenseBenefit | $ 1,191us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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