Subsequent Event (Notes)

3 Months Ended

Mar. 31, 2015

Subsequent Event [Abstract]

Subsequent Events [Text Block]

Subsequent Event

In April 2015, Lexicon announced that it will effect a reverse stock split at a ratio of one share of newly issued common stock for each seven shares of issued and outstanding common stock.  Lexicon anticipates that the reverse stock split will be effective on May 20, 2015, and that its common stock will commence trading on a split-adjusted basis on May 21, 2015.  Upon effectiveness of the reverse stock split, each seven shares of issued and outstanding common stock will be automatically converted into one newly issued and outstanding share of common stock.  Proportional adjustments will also be made to all shares of common stock issuable under Lexicon’s equity incentive plans and upon conversion of Lexicon’s Notes.  Concurrent with the reverse stock split, the authorized shares of common stock will be reduced from 900 million to 225 million.  No fractional shares will be issued in connection with the reverse stock split.  Any fractional share of common stock that would otherwise have resulted from the reverse stock split will be converted into cash payments equal to such fraction multiplied by the closing sales price of the common stock as last reported on the last trading day immediately preceding the effective date of the reverse stock split.