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Goodwill (Details) (USD $) In Millions, unless otherwise specified	Jul. 30, 2010	Jul. 12, 2001
Goodwill [Line Items]
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

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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

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Namespace Prefix:	lxrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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Namespace Prefix:	lxrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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