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Stock-based Compensation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2019
Stock-based Compensation |
Summary of stock option activity |
|  | Three Months Ended |  | Three Months Ended
|  | March 31, 2019 |  | March 31, 2018
|  |  |  | Weighted |  |  |  | Weighted
|  |  |  | Average |  |  |  | Average
|  | Number |  | Exercise |  | Number |  | Exercise
|  | Outstanding |  | Price |  | Outstanding |  | Price
Outstanding at beginning of period |  | 537,500 |  | $ | 2.19 |  | 537,500 |  | $ | 2.19
Granted during period |  | — |  |  | — |  | — |  |  | —
Exercised during period |  | — |  |  | — |  | — |  |  | —
Forfeited or expired during period |  | (82,500) |  |  | 4.89 |  | — |  |  | —
Outstanding at end of period |  | 455,000 |  | $ | 1.67 |  | 537,500 |  | $ | 2.19
Exercisable at end of period |  | 185,000 |  | $ | 1.74 |  | 267,500 |  | $ | 2.71
Summary of options outstanding and exercisable |
|  | Outstanding |  | Exercisable
|  |  |  | Weighted |  |  |  |  |  |
|  |  |  | Average |  | Weighted |  |  |  |  |  | Weighted |  |
|  |  |  | Remaining |  | Average |  | Aggregate |  |  |  | Average |  | Aggregate
|  | Number |  | Contractual |  | Exercise |  | Intrinsic |  | Number |  | Exercise |  | Intrinsic
Grant Date |  | Outstanding |  | Life |  | Price |  | Value |  | Outstanding |  | Price |  | Value
January 21, 2010 |  | 5,000 |  | 0.81 years |  | $ | 6.00 |  |  |  |  | 5,000 |  | $ | 6.00 |  |  |
February 24, 2016 |  | 450,000 |  | 6.90 years |  | $ | 1.62 |  |  |  |  | 180,000 |  | $ | 1.62 |  |  |
|  | 455,000 |  | 6.83 years |  | $ | 1.67 |  | $ | — |  | 185,000 |  | $ | 1.74 |  | $ | —

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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 number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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