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Organization and Summary of Significant Accounting Policies (Details 2) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Assumptions used and the resulting estimates of weighted-average fair value per share of options granted    
Weighted average / range of volatility 56.00% 61.00%
Risk-free interest rate 1.60% 2.00%
Dividend rate      
Expected life of options 4 years 6 months 4 years 6 months
Weighted average fair value of options granted $ 2.16 $ 2.59