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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Inputs to Option Valuation Model for Options Granted | The following table summarizes the inputs to the option valuation model for the options granted during the years ended December 31, 2018 and 2017:
|  | 2018 |  |  | 2017
Expected volatility |  |  | 31 | % |  | 27%
Dividend rate |  | 0% |  |  | 0%
Expected term (in years) |  | 3.55 |  |  | 3.55
Risk-free rate |  |  | 2.65 | % |  | 2.01%
Information About Stock Options Outstanding and Exercisable | The following table summarizes information about stock options outstanding and exercisable at December 31, 2018:
|  | Number of Shares Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant Date Fair Value |  |  | Weighted Average Remaining Term (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Option Balances at December 31, 2017 |  |  | 181,385 |  |  | $ | 4.98 |  |  | $ | 1.30 |  |  | 2.4 |  |  | $ | 158 |
Options Granted |  |  | 6,067 |  |  |  | 6.14 |  |  |  | 1.65 |  |  |  |  |  |  |  |  |
Options Exercised |  |  | (9,376 | ) |  |  | 3.89 |  |  |  | 0.94 |  |  |  |  |  |  |  |  |
Options Forfeited |  |  | (506 | ) |  |  | 4.34 |  |  |  | 0.87 |  |  |  |  |  |  |  |  |
Options Expired |  |  | (23,693 | ) |  |  | 7.26 |  |  |  | 2.33 |  |  |  |  |  |  |  |  |
Option Balances at December 31, 2018 |  |  | 153,877 |  |  | $ | 4.75 |  |  | $ | 1.18 |  |  |  | 2.0 |  |  | $ | 208 |
Options Exercisable at December 31, 2018 |  |  | 124,855 |  |  | $ | 4.61 |  |  | $ | 1.19 |  |  |  | 1.6 |  |  | $ | 186 |

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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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