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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Convertible Series A preferred stock [Member]
Dec. 31, 2011
Convertible Series A preferred stock [Member]
Dec. 31, 2012
Common Class A [Member]
Dec. 31, 2011
Common Class A [Member]
Dec. 31, 2012
Common Class B [Member]
Dec. 31, 2011
Common Class B [Member]
Common stock, par value     $ 0.001 $ 0.001 $ 0.001 $ 0.001
Common stock, shares authorized     100,000,000 100,000,000 100,000,000 100,000,000
Common Stock, Shares, Issued     31,798,000 30,162,000 4,197,000 5,280,000
Common stock, shares outstanding     31,798,000 30,162,000 4,197,000 5,280,000
Preferred stock, par value $ 0.001 $ 0.001        
Preferred stock, shares authorized 10,000 10,000        
Preferred Stock, Shares Issued 7,000 7,000        
Preferred Stock, Shares Outstanding 7,000 7,000