STOCK-BASED COMPENSATION (Details 4) (The 2004 Plan, USD $)	12 Months Ended
	Dec. 31, 2013
Stock-based compensation
Number Outstanding (in shares)	6,518,971
Weighted-Average Remaining Contractual Term	7 years 5 months 19 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 6.14
Number Exercisable (in shares)	3,448,487
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 5.66
$1.49 - $3.27
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 1.49
Range of Exercise Prices, high end of range (in dollars per share)	$ 3.27
Number Outstanding (in shares)	701,650
Weighted-Average Remaining Contractual Term	5 years 7 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 2.62
Number Exercisable (in shares)	692,367
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 2.61
$3.28 - $5.35
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 3.28
Range of Exercise Prices, high end of range (in dollars per share)	$ 5.35
Number Outstanding (in shares)	730,248
Weighted-Average Remaining Contractual Term	6 years 2 months 5 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 4.58
Number Exercisable (in shares)	542,135
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 4.32
$5.56 - $5.91
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 5.56
Range of Exercise Prices, high end of range (in dollars per share)	$ 5.91
Number Outstanding (in shares)	1,019,548
Weighted-Average Remaining Contractual Term	8 years 2 months 23 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 5.78
Number Exercisable (in shares)	454,094
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 5.74
$5.94 - $6.08
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 5.94
Range of Exercise Prices, high end of range (in dollars per share)	$ 6.08
Number Outstanding (in shares)	667,987
Weighted-Average Remaining Contractual Term	7 years 11 months 5 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 6.03
Number Exercisable (in shares)	299,774
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 6.04
$6.11 - $6.29
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 6.11
Range of Exercise Prices, high end of range (in dollars per share)	$ 6.29
Number Outstanding (in shares)	587,060
Weighted-Average Remaining Contractual Term	6 years 5 months 16 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 6.15
Number Exercisable (in shares)	336,790
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 6.17
$6.77 - $6.77
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 6.77
Range of Exercise Prices, high end of range (in dollars per share)	$ 6.77
Number Outstanding (in shares)	1,085,966
Weighted-Average Remaining Contractual Term	9 years 7 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 6.77
Number Exercisable (in shares)	215,738
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 6.77
$7.02 - $8.36
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 7.02
Range of Exercise Prices, high end of range (in dollars per share)	$ 8.36
Number Outstanding (in shares)	992,512
Weighted-Average Remaining Contractual Term	7 years 7 months 13 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 7.76
Number Exercisable (in shares)	539,862
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 7.88
$8.45 - $8.55
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 8.45
Range of Exercise Prices, high end of range (in dollars per share)	$ 8.55
Number Outstanding (in shares)	693,000
Weighted-Average Remaining Contractual Term	7 years 11 months 1 day
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 8.53
Number Exercisable (in shares)	356,789
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 8.54
$8.71 - $8.71
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 8.71
Range of Exercise Prices, high end of range (in dollars per share)	$ 8.71
Number Outstanding (in shares)	26,000
Weighted-Average Remaining Contractual Term	9 years 2 months 1 day
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 8.71
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 0.00
$9.02 - $9.02
Stock-based compensation
Range of Exercise Prices, low end of range (in dollars per share)	$ 9.02
Range of Exercise Prices, high end of range (in dollars per share)	$ 9.02
Number Outstanding (in shares)	15,000
Weighted-Average Remaining Contractual Term	7 years 2 months 19 days
Weighted-Average Exercise Price (Outstanding) (in dollars per share)	$ 9.02
Number Exercisable (in shares)	10,938
Weighted-Average Exercise Price (Exercisable) (in dollars per share)	$ 9.02