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Debt Obligations (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	Nov. 30, 2014	Apr. 30, 2004	Dec. 31, 2014
Debt Instrument
Proceeds from Convertible Debt	$ 87.5us-gaap_ProceedsFromConvertibleDebt
Convertible Debt Instrument Interest Rate Stated Percentage			5.25%lxrx_ConvertibleDebtInstrumentInterestRateStatedPercentage
Debt Instrument, Convertible, Conversion Ratio	829.1874us-gaap_DebtInstrumentConvertibleConversionRatio1
Debt Instrument, Convertible, Conversion Price			$ 1.206us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Issuance Cost	3.4us-gaap_DebtIssuanceCosts
Unamortized Debt Issuance Expense			3.3us-gaap_UnamortizedDebtIssuanceExpense
Debt Instrument, Fair Value Disclosure			81.0us-gaap_DebtInstrumentFairValue
Woodlands Mortgage		34.0lxrx_WoodlandsMortgage
Woodlands Cash Paid		20.8lxrx_WoodlandsCashPaid
Debt Instrument, Interest Rate, Stated Percentage			8.23%us-gaap_DebtInstrumentInterestRateStatedPercentage
Mortgage Loans on Real Estate, Carrying Amount of Mortgages			20.2us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Buildings Collateral			59.1lxrx_BuildingsCollateral
Land Collateral			$ 2.7lxrx_LandCollateral

X

- Definition

The buildings that serve as collateral for Lexicon's mortgage loan.

+ References

No definition available.

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X

- Definition

Contractual interest rate for funds borrowed under convertible debt, under the debt agreement.

+ References

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X

- Definition

The land that serves as collateral for Lexicon's mortgage loan.

+ References

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+ Details

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X

- Definition

In April 2004, Lexicon purchased its existing laboratory and office buildings and animal facilities in The Woodlands, Texas with proceeds from a $34.0 million third-party mortgage financing and $20.8 million in cash. This represents the $20.8 million cash paid.

+ References

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- Definition

In April 2004, Lexicon purchased its existing laboratory and office buildings and animal facilities in The Woodlands, Texas with proceeds from a $34.0 million third-party mortgage financing and $20.8 million in cash. This represents the original $34.0 million mortgage.

+ References

No definition available.

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X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

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-Glossary Conversion Rate

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

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

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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