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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2014
SHARE-BASED COMPENSATION |
Schedule of assumptions used to estimate the fair value of stock options granted |
|  | 2012 |  | 2013 |  | 2014 |
Risk free rate |  |  | 3.15 | % |  | 2.47 | % |  | — |
Volatility ratio |  |  | 78.79 | % |  | 89.60 | % |  | — |
Dividend yield |  |  | — |  |  | — |  |  | — |
Annual exit rate |  |  | 3.49 | % |  | 3.58 | % |  | — |
Exercise multiple |  |  | 4.40 |  |  | 4.10 |  |  | — |
Summary of the option activity |
|  | Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contract Terms |  | Aggregate Intrinsic Value |
|  |  |  | $ |  |  |  | $ |
Options outstanding at January 1, 2014 |  |  | 1,176,860 |  |  | 11.73 |  | 6 years |  |  | 22,405,886 |
Granted |  |  | — |  |  | — |  |  |  |  |  |
Exercised |  |  | (307,810 | ) |  | 10.62 |  |  |  |  |  |
Forfeited |  |  | (22,937 | ) |  | 8.85 |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2014 |  |  | 846,113 |  |  | 12.21 |  | 5 years |  |  | 11,793,938 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options vested or expected to be vested at December 31, 2014 |  |  | 822,866 |  |  | 12.25 |  | 4 years |  |  | 11,476,756 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable at December 31, 2014 |  |  | 739,676 |  |  | 12.59 |  | 4 years |  |  | 10,236,165 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of the RSU activity |
|  | Number of Shares |  | Weighted Average Grant-Date Fair Value |
|  |  |  | $ |
Unvested at January 1, 2014 |  |  | 2,077,640 |  |  | 4.32 |
Granted |  |  | 283,862 |  |  | 27.57 |
Vested |  |  | (625,003 | ) |  | 4.70 |
Forfeited |  |  | (126,280 | ) |  | 5.60 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested at December 31, 2014 |  |  | 1,610,219 |  |  | 7.76 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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