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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Schedule of Information with respect to stock options |
| No. of Shares (in thousands) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016 | 949 |  |  | $ | 5.22 |  |  | $ | 264 |
Options granted | 149 |  |  | 8.82 |  |  |
Options exercised | (271 | ) |  | 9.06 |  |  |
Forfeited and canceled | (31 | ) |  | 5.64 |  |  |
Expired | (35 | ) |  | 5.17 |  |  |
Outstanding at December 31, 2017 | 761 |  |  | $ | 5.80 |  |  | $ | 2,748 |
Vested and expected to vest at December 31, 2017 | 272 |  |  | $ | 7.30 |  |  | $ | 558 |
Total shares exercisable as of December 31, 2017 | 41 |  |  | $ | 5.46 |  |  | $ | 159 |
Shares remaining available for grant | 687 |  |  |  |  |  |  |
Schedule of assumptions for fair value of options at the date of the grant | The fair value of options at the date of the grant was estimated using the Black-Scholes model with the following assumptions for the respective period ending December 31:
| 2017 | 2016
Expected option life | 3.7 years |  | 5.7 years |
Weighted average risk-free interest rate | 2.2 | % | 1.3 | %
Weighted average expected volatility | 36 | % | 33 | %
Expected dividend yield | 0 | % | 0 | %
Schedule of share-based compensation by exercise price range | Stock options outstanding at 2017 are summarized as follows:
Range of Exercise Prices |  | Number Outstanding (in thousands) |  | Weighted Average Remaining Life |  | Weighted Average Exercise Price
$7.15 - $11.01 |  | 761 |  |  | 7.41 years |  | $ | 5.80 |
Schedule of activity with respect to non-vested stock options | Current year activity with respect to the Company’s non-vested restricted stock awards is as follows:
Non-vested restricted stock awards (in thousands) | Shares |  | Weighted Average grant- date fair value
Balance at January 1, 2017 | 163 |  |  | $ | 5.22 |
Granted | 92 |  |  | 8.61 |
Vested | (75 | ) |  | 8.42 |
Forfeited and canceled | (22 | ) |  | 8.34 |
Balance at December 31, 2017 | 158 |  |  | $ | 6.49 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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