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Common Stock Warrants
 12 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Common Stock Warrants
Common Stock Warrants

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
—

 
$
—



There were no warrants issued during the years ended June 30, 2014 and 2013. The weighted average fair value per share of warrants issued during the year ended June 30, 2012 was $6.00.

The aggregate intrinsic value of a warrant is the amount by which the market value of the underlying stock exceeds the exercise price of the warrant. The aggregate intrinsic value for warrants at June 30, 2013 and 2012 was $25,697, and $2,167, respectively.