Common Stock Warrants (Details) (USD $)	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Common stock warrant activity
Warrants outstanding, Beginning balance (in shares)	2,091,718	2,457,433	2,690,424
Issued (in shares)	0.00	0.00	82,856
Exercised (in shares)	(2,063,904)	(362,861)	(313,239)
Expired (in shares)	(27,814)	(2,854)	(2,608)
Warrants outstanding, Ending balance (in shares)	0	2,091,718	2,457,433
Expired, Price range (in usd per share)	$ 8.83
Minimum
Common stock warrant activity
Warrants outstanding, Price range, Beginning balance (in usd per share)	8.78	8.78	8.78
Issued, price range (in usd per share)			$ 9.33
Exercised, Price range (in usd per share)	$ 8.78	$ 8.83	$ 8.78
Expired, Price range (in usd per share)		$ 0.00	$ 8.79
Warrants outstanding, Price range, Ending balance (in usd per share)	0.00	8.78	8.78
Maximum
Common stock warrant activity
Warrants outstanding, Price range, Beginning balance (in usd per share)	61.30	61.30	61.30
Issued, price range (in usd per share)			$ 9.80
Exercised, Price range (in usd per share)	$ 9.33	$ 9.80	$ 8.83
Expired, Price range (in usd per share)	$ 61.30		$ 8.83
Warrants outstanding, Price range, Ending balance (in usd per share)	0.00	61.30	61.30