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Benefit Plan | 12 Months Ended
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Dec. 31, 2018
Benefit Plan [Abstract] |
Benefit Plan | Benefit Plan Lexicon maintains a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code. The plan covers substantially all full-time employees. Participating employees may defer a portion of their pretax earnings, up to the Internal Revenue Service annual contribution limit. Beginning in 2000, the Company was required to match employee contributions according to a specified formula. The matching contributions totaled $1.0 million, $1.0 million and $0.7 million in the years ended December 31, 2018, 2017 and 2016, respectively. Company contributions are vested based on the employee’s years of service, with full vesting after four years of service.

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- Definition Benefit Plan [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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