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SIGNIFICANT ACCOUNTING POLICIES (Details 2)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dividend yield 0.00% 0.00%
Expected volatility, Minimum 63.30% 61.20%
Expected volatility, Maximum 65.30% 62.80%
Risk-free interest rate, Minimum   2.53%
Risk-free interest rate, Maximum   3.71%
Risk-free interest rate 2.10%  
Expected forfeiture (employees) 8.40% 9.70%
Expected forfeiture (executives) 5.20% 7.10%
Contractual term of up to 10 years 10 years
Suboptimal exercise multiple (employees) 2.7 2.3
Suboptimal exercise multiple (executives) 3.2 3