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Summary of Significant Accounting Policies Equity Incentive Awards (Tables) | 9 Months Ended
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Sep. 30, 2018
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Expected Volatility |  | Risk-free Interest Rate |  | Expected Term |  | Dividend Rate
September 30, 2018: |  |  |  |  |  |  |  |
Employees |  | 58 | % |  | 2.6 | % |  | 4 |  | — | %
Officers and non-employee directors |  | 63 | % |  | 2.8 | % |  | 8 |  | — | %
September 30, 2017: |  |  |  |  |  |  |  |
Employees |  | 61 | % |  | 1.7 | % |  | 4 |  | — | %
Officers and non-employee directors |  | 70 | % |  | 2.2 | % |  | 8 |  | — | %
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Options |  | Weighted Average Exercise Price
|  | (in thousands) |  |
Outstanding at December 31, 2017 |  | 4,961 |  |  | $ | 11.17 |
Granted |  | 1,811 |  |  | 10.08 |
Exercised |  | (70 | ) |  | 7.93 |
Expired |  | (229 | ) |  | 14.30 |
Forfeited |  | (279 | ) |  | 11.61 |
Outstanding at September 30, 2018 |  | 6,194 |  |  | 10.75 |
Exercisable at September 30, 2018 |  | 3,521 |  |  | $ | 10.80 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  | Weighted Average Grant Date Fair Value
|  | (in thousands) |  |
Outstanding at December 31, 2017 |  | 946 |  |  | $ | 10.50 |
Granted |  | 872 |  |  | 9.79 |
Vested |  | (334 | ) |  | 9.85 |
Forfeited |  | (178 | ) |  | 10.58 |
Outstanding at September 30, 2018 |  | 1,306 |  |  | $ | 10.18 |
Share-basedGranttoBOD | During the nine months ended September 30, 2018, Lexicon granted its non-employee directors 20,512 shares of restricted stock awards. The restricted stock awards had a weighted average grant date fair value of $7.80 per share and vested immediately

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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