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STOCK-BASED COMPENSATION (Details - Plan Information and P&L Impact) | 12 Months Ended
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Dec. 31, 2016 USD ($) plan shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Number of active plans | plan | 1 |  |
Number of shares authorized | shares | 4,350,000.00 |  |
Term of plan | 10 years |  |
Non-cash compensation expense related to equity awards |  |  |
Non-cash stock-based compensation expense before income taxes | $ 9,647,000 | $ 8,508,000 | $ 7,446,000
Income tax benefit related to non-cash compensation | 3,700,000 | 3,000,000 | 0
Performance Shares [Member] |  |  |
Unrecognized compensation cost |  |  |
Unrecognized compensation cost | $ 1,700,000 |  |
Weighted-average period for recognition of unrecognized compensation cost | 1 year 11 months 5 days |  |
Stock Options |  |  |
Unrecognized compensation cost |  |  |
Unrecognized compensation cost | $ 7,800,000 |  |
Weighted-average period for recognition of unrecognized compensation cost | 1 year 6 months 10 days |  |
RSUs |  |  |
Unrecognized compensation cost |  |  |
Unrecognized compensation cost | $ 7,500,000 |  |
Weighted-average period for recognition of unrecognized compensation cost | 1 year 11 months |  |
Restricted Stock |  |  |
Unrecognized compensation cost |  |  |
Unrecognized compensation cost | $ 100,000 |  |
Weighted-average period for recognition of unrecognized compensation cost | 5 months |  |
Cost of revenue |  |  |
Non-cash compensation expense related to equity awards |  |  |
Non-cash stock-based compensation expense before income taxes | $ 129,000 | 95,000 | 32,000
Selling and marketing expense |  |  |
Non-cash compensation expense related to equity awards |  |  |
Non-cash stock-based compensation expense before income taxes | 2,722,000 | 1,597,000 | 901,000
General and administrative expense |  |  |
Non-cash compensation expense related to equity awards |  |  |
Non-cash stock-based compensation expense before income taxes | 4,699,000 | 5,120,000 | 5,148,000
Product development |  |  |
Non-cash compensation expense related to equity awards |  |  |
Non-cash stock-based compensation expense before income taxes | 2,097,000 | 1,558,000 | 1,196,000
Restructuring and severance |  |  |
Non-cash compensation expense related to equity awards |  |  |
Non-cash stock-based compensation expense before income taxes | $ 0 | $ 138,000 | $ 169,000

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- Definition The period of time, from the grant date until the time at which the share-based [option] award expires. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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