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Stock-Based Incentive Plan (Details 2) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2010
Common stock
Jul. 31, 2010
Common stock
Jun. 30, 2010
Common stock
Jun. 30, 2012
Common stock
Sep. 10, 2010
Common stock
Sep. 08, 2009
Common stock
Jun. 30, 2012
Stock Options and Incentive Warrants
Jun. 30, 2012
Stock Options
Jun. 30, 2011
Stock Options
Jun. 30, 2010
Stock Options
Number of Stock Options and Incentive Warrants                    
Stock Options and Incentive Warrants outstanding at the beginning of the period (in shares)             5,392,820      
Exercised (in shares)             (20,000)      
Stock Options and Incentive Warrants outstanding at the end of the period (in shares)             5,372,820      
Vested or expected to vest at the end of the period (in shares)             5,372,820      
Exercisable at the end of the period (in shares)             5,353,898      
Weighted Average Exercise Price                    
Stock Options and Incentive Warrants outstanding at the beginning of the period (in dollars per share)             $ 1.85      
Exercised (in dollars per share)             $ 4.10      
Stock Options and Incentive Warrants outstanding at the end of the period (in dollars per share)             $ 1.83      
Vested or expected to vest at the end of the period (in dollars per share)             $ 1.83      
Exercisable at the end of the period (in dollars per share)             $ 1.83      
Aggregate Intrinsic Value                    
Stock Options and Incentive Warrants outstanding at the end of the period             $ 34,957,022      
Vested or expected to vest at the end of the period             34,957,022      
Exercisable at the end of the period (in dollars)             34,875,456      
Weighted Average Remaining Contractual Term (in years)                    
Stock Options and Incentive Warrants outstanding at the end of the period             3 years 4 months 24 days      
Vested or expected to vest at the end of the period             3 years 4 months 24 days      
Exercisable at the end of the period             3 years 4 months 24 days      
Additional disclosures of Stock Options and Incentive Warrants                    
Market price of common stock on the last trading date of the period (in dollars per share)       $ 8.34 $ 5.49 $ 2.68        
Number of Stock Options exercised (in shares) 30,000 6,875 3,000         20,000 86,875 3,000
Aggregate intrinsic value of Stock Options exercised               $ 54,000 $ 493,923 $ 13,620