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Stock-Based Incentive Plan (Details 2) (USD $)
 9 Months Ended
Mar. 31, 2013
Common stock
  
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) $ 10.15
Stock Options and Incentive Warrants
  
Number of Stock Options and Incentive Warrants  
Stock Options and Incentive Warrants outstanding at the beginning of the period (in shares) 5,372,820
Exercised (in shares) (330,000)
Stock Options and Incentive Warrants outstanding at the end of the period (in shares) 5,042,820
Vested or expected to vest at the end of the period (in shares) 5,042,820
Exercisable at the end of the period (in shares) 5,042,820
Weighted Average Exercise Price  
Stock Options and Incentive Warrants outstanding at the beginning of the period (in dollars per share) $ 1.83
Exercised (in dollars per share) $ 0.78
Stock Options and Incentive Warrants outstanding at the end of the period (in dollars per share) $ 1.90
Vested or expected to vest at the end of the period (in dollars per share) $ 1.90
Exercisable at the end of the period (in dollars per share) $ 1.90
Aggregate Intrinsic Value  
Stock Options and Incentive Warrants outstanding at the end of the period $ 41,588,327
Vested or expected to vest at the end of the period 41,588,327
Exercisable at the end of the period (in dollars) 41,588,327
Weighted Average Remaining Contractual Term (in years)  
Stock Options and Incentive Warrants outstanding at the end of the period 2 years 9 months 18 days
Vested or expected to vest at the end of the period 2 years 9 months 18 days
Exercisable at the end of the period 2 years 9 months 18 days
Additional disclosures of Stock Options and Incentive Warrants  
Number of Stock Options exercised (in shares) 330,000
Aggregate intrinsic value of Stock Options exercised $ 3,000,700