Annual report pursuant to Section 13 and 15(d)

Organization and Summary of Significant Accounting Policies (Assumptions Used To Calculate Fair Value) (Details)

v2.4.0.6
Organization and Summary of Significant Accounting Policies (Assumptions Used To Calculate Fair Value) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility, minimum 63.00% 64.00% 61.00%
Expected volatility, maximum 72.00% 71.00% 68.00%
Weighted-average volatility 65.00% 69.00% 66.00%
Expected dividends         
Risk-free rate, minimum 0.60% 1.30% 1.70%
Risk-free rate, maximum 1.20% 2.40% 2.40%
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term 5 years 5 years 3 months 18 days 6 years
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term 6 years 3 months 18 days 6 years 3 months 18 days 6 years 3 months 18 days