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Stockholders' Equity (Narrative) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Employee Stock Purchase Plan |  |
Stock-based compensation | $ 2,914,000 us-gaap_ShareBasedCompensation | $ 2,067,000 us-gaap_ShareBasedCompensation
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Rights | 1/8 on the six month anniversary of the date of grant, and 1/48 each month thereafter for 42 months |
Award Expiration Period | 10 years |
Weighted-average grant date fair value of stock options | $ 32.30 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Intrinsic value of options exercised | 1,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 12,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Unrecognized compensation cost | 17,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Weighted-average period in which cost is expected to be recognized | 2 years 7 months 6 days |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 3 years |
Weighted-average period in which cost is expected to be recognized | 2 years 2 months 12 days |
Unrecognized compensation cost, restricted stock | 5,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future option grants | 700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = lgnd_TwoThousandTwoStockIncentivePlanMember |
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Expiration Period | 6 months | 6 months
Employee Stock Purchase Plan |  |
Shares allowed to purchase in employee stock purchase plan | 1,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Offering period of shares in employee stock purchase plan | 6 months |
Percentage of purchase price of stock | 85.00%lgnd_PercentageOfPurchasePriceOfStock / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Discount rate | 15.00%lgnd_DiscountRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Shares issued in period | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Stock-based compensation | 21,000 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember | 13,000 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Shares available for future purchases | 75,741 us-gaap_EmployeeServiceShareBasedCompensationEstimatedQuantityOfSharesToBeRepurchasedInFollowingPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Volatility rate | 36.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember | 38.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Employee Stock Purchase Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net proceeds from employee stock purchase plan | 800,000 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember | 3,200,000 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember
Tax benefit related to options exercised | $ 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Certain Directors | 2002 Stock Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 1 year |
Employees |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 4 years |
Vesting Period One | 2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 6 months |
Award Vesting Rights, Percentage | 12.50%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = lgnd_TwoThousandTwoStockIncentivePlanMember / us-gaap_VestingAxis = lgnd_VestingPeriodOneMember |
Vesting Period Two | 2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 42 months |
Award Vesting Rights, Percentage | 2.08%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = lgnd_TwoThousandTwoStockIncentivePlanMember / us-gaap_VestingAxis = lgnd_VestingPeriodTwoMember |

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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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