|
SHARE-BASED COMPENSATION (Summary of Information with respect to Options Outstanding) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2014
|
| Options outstanding |
|
| Number of options outstanding (in shares) |
22,023,269 |
| Weighted-Average Remaining Contractual life |
5 years 4 months 20 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.59 |
| Intrinsic value at the end of the period (in dollars) |
$ 22,969 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
15,067,137 |
| Weighted-average remaining contractual life |
4 years 1 month 13 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.50 |
| Intrinsic value at the end of the period (in dollars) |
$ 17,100 |
| 0.00-0.38 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 0.0001 |
| Exercise prices, high end of range (in dollars per share) |
$ 0.38 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
16,395,343 |
| Weighted-Average Remaining Contractual life |
5 years 1 month 20 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.17 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
12,457,211 |
| Weighted-average remaining contractual life |
4 years 6 months 11 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.16 |
| 0.40-0.63 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 0.40 |
| Exercise prices, high end of range (in dollars per share) |
$ 0.63 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
156,000 |
| Weighted-Average Remaining Contractual life |
7 years 5 months 19 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.48 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
53,600 |
| Weighted-average remaining contractual life |
4 years 7 months 24 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.47 |
| 0.68-0.97 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 0.68 |
| Exercise prices, high end of range (in dollars per share) |
$ 0.97 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
1,395,556 |
| Weighted-Average Remaining Contractual life |
7 years 4 months 13 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.85 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
489,556 |
| Weighted-average remaining contractual life |
4 years 4 months 20 days |
| Weighted-average exercise price (in dollars per share) |
$ 0.81 |
| 1.00-1.39 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 1.00 |
| Exercise prices, high end of range (in dollars per share) |
$ 1.39 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
351,570 |
| Weighted-Average Remaining Contractual life |
3 years 2 months 1 day |
| Weighted-average exercise price (in dollars per share) |
$ 1.22 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
341,970 |
| Weighted-average remaining contractual life |
3 years 1 month 10 days |
| Weighted-average exercise price (in dollars per share) |
$ 1.23 |
| 1.47-1.60 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 1.47 |
| Exercise prices, high end of range (in dollars per share) |
$ 1.60 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
63,100 |
| Weighted-Average Remaining Contractual life |
2 years 3 months 18 days |
| Weighted-average exercise price (in dollars per share) |
$ 1.57 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
63,100 |
| Weighted-average remaining contractual life |
2 years 3 months 18 days |
| Weighted-average exercise price (in dollars per share) |
$ 1.57 |
| 1.73-2.10 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 1.73 |
| Exercise prices, high end of range (in dollars per share) |
$ 2.10 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
2,207,200 |
| Weighted-Average Remaining Contractual life |
8 years 11 months 1 day |
| Weighted-average exercise price (in dollars per share) |
$ 1.93 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
207,200 |
| Weighted-average remaining contractual life |
5 months 19 days |
| Weighted-average exercise price (in dollars per share) |
$ 1.96 |
| 2.27-2.59 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 2.27 |
| Exercise prices, high end of range (in dollars per share) |
$ 2.59 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
623,000 |
| Weighted-Average Remaining Contractual life |
1 year 5 months 23 days |
| Weighted-average exercise price (in dollars per share) |
$ 2.50 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
623,000 |
| Weighted-average remaining contractual life |
1 year 5 months 23 days |
| Weighted-average exercise price (in dollars per share) |
$ 2.50 |
| 2.75-2.82 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 2.75 |
| Exercise prices, high end of range (in dollars per share) |
$ 2.82 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
506,500 |
| Weighted-Average Remaining Contractual life |
1 year 2 months 12 days |
| Weighted-average exercise price (in dollars per share) |
$ 2.81 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
506,500 |
| Weighted-average remaining contractual life |
1 year 2 months 12 days |
| Weighted-average exercise price (in dollars per share) |
$ 2.81 |
| 3.00-3.37 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 3.00 |
| Exercise prices, high end of range (in dollars per share) |
$ 3.37 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
185,000 |
| Weighted-Average Remaining Contractual life |
1 year 4 months 17 days |
| Weighted-average exercise price (in dollars per share) |
$ 3.14 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
185,000 |
| Weighted-average remaining contractual life |
1 year 4 months 17 days |
| Weighted-average exercise price (in dollars per share) |
$ 3.14 |
| 4.22-4.55 [Member] |
|
| Information with respect to options outstanding [Line Items] |
|
| Exercise prices, low end of range (in dollars per share) |
$ 4.22 |
| Exercise prices, high end of range (in dollars per share) |
$ 4.55 |
| Options outstanding |
|
| Number of options outstanding (in shares) |
140,000 |
| Weighted-Average Remaining Contractual life |
1 year 3 months 14 days |
| Weighted-average exercise price (in dollars per share) |
$ 4.46 |
| Options exercisable |
|
| Number of options exercisable (in shares) |
140,000 |
| Weighted-average remaining contractual life |
1 year 3 months 14 days |
| Weighted-average exercise price (in dollars per share) |
$ 4.46 |