XML 28 R24.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Significant Account Policies [Line Items]        
Current average expected forfeiture rate (percentage) 50.21% 50.21% 50.21% 50.21%
Equity Incentive 2007 Plan [Member]
       
Significant Account Policies [Line Items]        
Expected term (in years)   5 years   5 years
Weighted average volatility (pecentage)   55.08%   54.96%
Weighted average risk free interest rate (percentage)   1.89%   2.36%
Expected dividends   0.00%   0.00%
Equity Incentive 2011 Plan [Member]
       
Significant Account Policies [Line Items]        
Expected term (in years) 5 years 5 years 5 years 5 years
Weighted average volatility (pecentage) 54.93% 55.08% 54.93% 55.08%
Weighted average risk free interest rate (percentage) 0.76% 1.88% 0.76% 1.88%
Expected dividends 0.00% 0.00% 0.00% 0.00%