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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Option Activity | A summary of option activity under our 1998 Stock Option Plan as of December 31, 2018, and changes during the three months ended March 31, 2019 is presented below.
| Number of Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2018 | 283,686 |  | $ | 20.46 |  | 3.58 |  | $ | 434
Exercised | (56,352) |  | 8.97 |  | — |  | 474
Canceled/Forfeited | (2,000) |  | 26.66 |  | — |  | —
Outstanding, March 31, 2019 | 225,334 |  | $ | 23.28 |  | 4.18 |  | $ | 26
Exercisable, March 31, 2019 | 214,901 |  | $ | 23.04 |  | 4.00 |  | $ | 26
Summary of Stock Options Outstanding | The following table summarizes information about our stock options outstanding at March 31, 2019:
Range of Exercise Prices | Options Outstanding |  |  |  |  |  | Options Exercisable |  |
| Shares |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
$0.01-15.70 | 8,500 |  | 2.82 |  | $ | 14.89 |  | 8,500 |  | $ | 14.89
$15.71-17.81 | 42,000 |  | 1.32 |  | 17.54 |  | 42,000 |  | 17.54
$17.82-20.48 | 50,500 |  | 2.09 |  | 19.43 |  | 50,500 |  | 19.43
$20.49-33.36 | 124,334 |  | 6.08 |  | 27.36 |  | 113,901 |  | 27.29
| 225,334 |  | 4.18 |  | $ | 23.28 |  | 214,901 |  | $ | 23.04
Status of Unvested Stock Options | The summary of the status of our unvested stock options as of December 31, 2018 and changes during the three months ended March 31, 2019 is presented below.
Unvested stock options: | Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested at December 31, 2018 | 20,865 |  | $ | 11.93
Vested | (10,432) |  | 11.93
Unvested at March 31, 2019 | 10,433 |  | $ | 11.93

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -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 change in stock options. + References No definition available. + Details
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