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SHARE BASED COMPENSATION (Summary of Fair Value Assumptions) (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 16, 2013 | Jan. 01, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility |  |  | 51.70% |  |
Expected dividends yield | 0.00% | 0.00% | 0.00% |  |
Exercise multiple | 2.0 | 2.0 | 2.2 |  |
Risk-free interest rate per annum |  |  | 3.81% |  |
Estimated fair value of underlying ordinary shares (per share) |  |  | $ 8.60 |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility | 63.50% | 62.30% |  |  |
Risk-free interest rate per annum | 2.15% | 2.68% |  |  |
Estimated fair value of underlying ordinary shares (per share) | $ 9.99 | $ 9.28 |  |  | $ 3.75
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected volatility | 68.80% | 70.90% |  |  |
Risk-free interest rate per annum | 3.18% | 2.99% |  |  |
Estimated fair value of underlying ordinary shares (per share) | $ 16.54 | $ 12.85 |  | $ 5.69 |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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