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Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 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
Weighted average volatility (percentage)       54.96%
Weighted average risk free interest rate (percentage)       2.36%
Expected dividends       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 (percentage) 54.46% 54.89% 54.90% 55.05%
Weighted average risk free interest rate (percentage) 0.65% 1.64% 0.75% 1.84%
Expected dividends 0.00% 0.00% 0.00% 0.00%