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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |
Summary of Stock Option Activity | A summary of stock options expired and forfeited under our stock incentive plans and stock options outstanding as of, and changes made during, the six months ended June 30, 2018, is presented below (shares in thousands):
| Outstanding |  | Exercisable
| Number of Shares Underlying Options |  | Weighted Average Exercise Price |  | Number of Shares Underlying Options |  | Weighted Average Exercise Price
Options outstanding, December 31, 2017 | 1,202 |  |  | $ | 1.99 |  |  | 1,202 |  |  | $ | 1.99 |
Expired | (3 | ) |  | 2.45 |  |  |  |  |
Forfeited | (10 | ) |  | 1.63 |  |  |  |  |
Options outstanding, June 30, 2018 | 1,189 |  |  | $ | 1.99 |  |  | 1,189 |  |  | $ | 1.99 |

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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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