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Convertible Preferred Stock Warrants (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2012
investors
Dec. 31, 2011
Jul. 13, 2009
Sep. 30, 2012
Price of 6 Dollars And 72 Cents [Member]
Sep. 30, 2012
Price Of 7 Dollars And 93 Cents [Member]
Oct. 06, 2012
Price of 7 Dollars And 86 Cents [Member]
Sep. 30, 2012
Price of 7 Dollars And 86 Cents [Member]
Sep. 30, 2012
Warrant [Member]
Dec. 31, 2011
Warrant [Member]
Sep. 30, 2012
Warrant [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Warrant [Member]
Fair Value, Inputs, Level 2 [Member]
Class of Warrant or Right [Line Items]                      
Number of Warrants Outstanding             52,121        
Expiration Date of Warrants Outstanding             Oct. 06, 2012        
Exercise Price of Warrants Outstanding       6.72 7.93   7.86        
Warrants converted to Class A Shares           12,487          
Warrant Strike Price $ 6.95                    
Conversion of Preferred Shares to Common Shares     1,706,682                
Warrants outstanding $ 137 $ 451         $ 137 $ 137 $ 451 $ 137 $ 451
Preferred Stock Investors 4                    
Preferred Stock A-2 Investors 3