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Note 9. Stock Based Compensation (Detail) - Stock Option and Restricted Stock Awards (USD $)
9 Months Ended 57 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Equity awards outstanding at December 31, 2011 3,113,144    
Equity awards outstanding at December 31, 2011 (in Dollars per share) $ 3.75    
Equity awards outstanding at December 31, 2011 54,867    
Equity awards outstanding at December 31, 2011 (in Dollars per share) $ 3.16    
Equity awards granted 623,251   3,477,143
Equity awards granted (in Dollars per share) $ 2.11    
Equity awards granted 5,544    
Equity awards granted (in Dollars per share) $ 2.10 $ 2.68  
Equity awards exercised (9,557)    
Equity awards exercised (in Dollars per share) $ 2.86    
Equity awards exercised (38,750)    
Equity awards exercised (in Dollars per share) $ 2.70    
Equity awards forfeited, cancelled or expired (264,669)    
Equity awards forfeited, cancelled or expired (in Dollars per share) $ 6.80    
Equity awards forfeited, cancelled or expired (6,667)    
Equity awards forfeited, cancelled or expired (in Dollars per share) $ 2.86    
Equity awards outstanding at September 30, 2012 3,432,976   3,432,976
Equity awards outstanding at September 30, 2012 (in Dollars per share) $ 3.24   $ 3.24
Equity awards outstanding at September 30, 2012 44,167   44,167
Equity awards outstanding at September 30, 2012 (in Dollars per share) $ 3.13   $ 3.13
Equity awards outstanding at September 30, 2012 6 years 295 days   6 years 295 days
Aggregate intrinsic value of outstanding awards at September 30, 2012 (in Dollars) $ 7,723,556   $ 7,723,556
Aggregate intrinsic value of outstanding awards at September 30, 2012 (in Dollars) 239,385   239,385
Equity awards exercisable at September 30, 2012 2,062,954   2,062,954
Equity awards exercisable at September 30, 2012 (in Dollars per share) $ 3.74   $ 3.74
Equity awards exercisable at September 30, 2012 5 years 208 days   5 years 208 days
Aggregate intrinsic value of awards exercisable at September 30, 2012 (in Dollars) $ 3,574,674   $ 3,574,674