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Common Stock Warrants (Tables)
12 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Common stock warrant activity
The following summarizes common stock warrant activity:
 
Warrants
Outstanding
 
Price Range
per Share
Warrants outstanding at June 30, 2011
2,690,424

 
$
8.78 - 61.30

Issued
82,856

 
$
9.33 - 9.80

Exercised
(313,239
)
 
$
8.78 - 8.83

Expired
(2,608
)
 
$
8.79 - 8.83

Warrants outstanding at June 30, 2012
2,457,433

 
$
8.78 - 61.30

Exercised
(362,861
)
 
$
8.83 - 9.80

Expired
(2,854
)
 
$

Warrants outstanding at June 30, 2013
2,091,718

 
$
8.78 - 61.30

Exercised
(2,063,904
)
 
$
8.78 - 9.33

Expired
(27,814
)
 
$
8.83 - 61.30

Warrants outstanding at June 30, 2014

 
$