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Stock Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Options Activity | The following table summarizes the collective activity under the 2000 Plan and the 2010 Plan:
| Number of Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 31, 2015 | 4,139 |  |  | $ | 7.740 |  |  |  |  |
Granted(1) | 665 |  |  | 4.703 |  |  |  |  |
Exercised | (321 | ) |  | 3.286 |  |  |  |  |
Forfeited | (194 | ) |  | 8.154 |  |  |  |  |
Expired | (318 | ) |  | 11.293 |  |  |  |  |
Outstanding at December 31, 2016 | 3,971 |  |  | 7.300 |  |  |  |  |
Granted(1) | 390 |  |  | 6.061 |  |  |  |  |
Exercised | (401 | ) |  | 4.935 |  |  |  |  |
Forfeited | (41 | ) |  | 6.421 |  |  |  |  |
Expired | (85 | ) |  | 10.157 |  |  |  |  |
Outstanding at December 31, 2017 | 3,834 |  |  | 7.367 |  |  |  |  |
Granted(1) | 518 |  |  | 10.878 |  |  |  |  |
Exercised | (909 | ) |  | 7.367 |  |  |  |  |
Forfeited | (87 | ) |  | 4.726 |  |  |  |  |
Expired | (51 | ) |  | 9.146 |  |  |  |  |
Outstanding at December 31, 2018 | 3,305 |  |  | $ | 8.050 |  |  | 4.99 |  | $ | 20,120 |
Options exercisable at December 31, 2018 | 1,926 |  |  | $ | 8.824 |  |  | 2.87 |  | $ | 10,237 |
Expected to vest at December 31, 2018 | 1,379 |  |  | $ | 6.970 |  |  | 7.94 |  | $ | 9,883 |
(1) Grants are related to the 2010 Plan.
Schedule of Stock Options Valuation Assumptions | The following table sets forth the significant assumptions used in the model during 2018, 2017 and 2016:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Expected dividend yield | —% |  | —% |  | —%
Risk-free interest rate | 2.71%-3.00% |  | 1.96%-2.36% |  | 1.16%-1.77%
Expected volatility | 43%-45% |  | 46% |  | 46%-49%
Expected life | 6.5 years |  | 6.5 years |  | 6.5-10 years

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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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