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SHARE BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2017
SHARE BASED COMPENSATION [Abstract] |
Schedule of Assumptions Used | The following assumptions were used in the Binomial option pricing model:
|  | Year Ended December 31, 2015 |
Options granted |  | Average risk-free rate of return |  | Exercise multiple |  | Volatility rate |  | Dividend yield |  | Post- vesting forfeiture rate |
January 12, 2015 |  | 2.82% |  | 1.8-3 times |  | 93.0% |  | 0% |  | 5%-8% |
July 06, 2015 |  | 3.20% |  | 3 times |  | 91.0% |  | 0% |  | 5% |
September 09, 2015 |  | 2.94%-3.08% |  | 1.8-3 times |  | 91.0%-92.0% |  | 0% |  | 5%-8% |
Summary of Stock Option Activity | A summary of the aggregate option activity and information regarding options outstanding as of December 31, 2017 is as follows:
|  | Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contract Life |  | Aggregate Intrinsic Value |
Options outstanding on January 1, 2017 |  |  | 15,259,141 |  |  | 0.50 |  |  |  |  |  |  |
Granted |  |  | — |  |  | — |  |  |  |  |  |  |
Forfeited |  |  | (24,965) |  |  | 0.59 |  |  |  |  |  |  |
Expired |  |  | (3,584) |  |  | 0.59 |  |  |  |  |  |  |
Exercised |  |  | (5,596,050) |  |  | 0.49 |  |  |  |  |  |  |
Options outstanding on December 31, 2017 |  |  | 9,634,542 |  |  | 0.50 |  |  | 5.59 |  |  | 18,935,239 |
Options vested or expected to vest on December 31, 2017 |  |  | 19,017,508 |  |  | 0.46 |  |  | 5.00 |  |  | 38,124,185 |
Options exercisable on December 31, 2017 |  |  | 8,282,615 |  |  | 0.48 |  |  | 5.34 |  |  | 16,408,217 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | A summary of the non-vested RSU activity in 2017 is as follows:
|  | Number of RSUs |  | Weighted Average Grant Date Fair Value |
Nonvested RSUs on January 1, 2017 |  |  | — |  |  | — |
Granted |  |  | 12,653,992 |  |  | 0.98 |
Vested |  |  | (2,366,374) |  |  | 0.98 |
Forfeited |  |  | (46,875) |  |  | 0.98 |
Nonvested RSUs on December 31, 2017 |  |  | 10,240,743 |  |  | 0.98 |

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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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