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Goodwill (Details) - USD ($) $ in Millions | Jul. 30, 2010 | Jul. 12, 2001
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Goodwill [Abstract] |  |
Coelacanth Goodwill |  | $ 25.8
Coelacanth Purchase Price |  | $ 36.0
Symphony Icon Goodwill | $ 18.7 |

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- Definition On July 12, 2001, Lexicon completed the acquisition of Coelacanth Corporation in a merger. Goodwill associated with the acquisition of $25.8 million, which represents the excess of the $36.0 million purchase price over the fair value of the underlying net identifiable assets, was assigned to the consolidated entity, Lexicon. This represents the goodwill. + References No definition available. + Details
Name: | lxrx_CoelacanthGoodwill
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition On July 12, 2001, Lexicon completed the acquisition of Coelacanth Corporation in a merger. Goodwill associated with the acquisition of $25.8 million, which represents the excess of the $36.0 million purchase price over the fair value of the underlying net identifiable assets, was assigned to the consolidated entity, Lexicon. This represents the purchase price. + References No definition available. + Details
Name: | lxrx_CoelacanthPurchasePrice
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Goodwill [Abstract] + References No definition available. + Details
Name: | lxrx_GoodwillAbstract
Namespace Prefix: | lxrx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition On July 30, 2010, Lexicon exercised its Purchase Option and completed the acquisition of Symphony Icon. Goodwill associated with the acquisition of $18.7 million, which represents the assets recognized in connection with the deferred tax liability acquired and did not result from excess purchase price, was assigned to the consolidated entity, Lexicon. + References No definition available. + Details
Name: | lxrx_SymphonyIconGoodwill
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant