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Loss Per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic loss per share is computed by dividing net loss for the period by the weighted-average number of shares of common stock outstanding during that period.  The diluted loss per share calculation gives effect to dilutive stock options, warrants and other potentially dilutive common stock equivalents outstanding during the period.  Diluted loss per share is based on the treasury stock method and includes the effect from potential issuance of common stock, such as shares issuable pursuant to the exercise of stock options and warrants, assuming the exercise of all in-the-money stock options based on the average market price during the period.  Common stock equivalents have been excluded where their inclusion would be anti-dilutive.
Details in the computation of basic and diluted loss per share is as follows:
 
For the three months ended  September 30,
 
For the nine months ended  September 30,
($ in thousands except share and per share data)
2015
 
2014
 
2015
 
2014
Loss per share - basic:
 

 
 

 
 

 
 

Numerator for basic loss per share
$
(1,521
)
 
$
(6,012
)
 
$
(16,802
)
 
$
(22,278
)
Denominator for basic loss per share
43,021,121

 
40,856,815

 
41,598,632

 
40,766,741

Basic loss per common share
$
(0.04
)
 
$
(0.15
)
 
$
(0.40
)
 
$
(0.55
)
Loss per share - diluted:
 

 
 

 
 

 
 

Numerator for diluted loss per share
$
(1,521
)
 
$
(6,012
)
 
$
(16,802
)
 
$
(22,278
)
Adjustment for income (expense) for change in fair value of warrant liability for dilutive warrants
1,529

 
1,098

 
1,529

 
2,364

Net loss attributable to common share
$
(3,050
)
 
$
(7,110
)
 
$
(18,331
)
 
$
(24,642
)
Denominator for basic loss per share
43,021,121

 
40,856,815

 
41,598,632

 
40,766,741

Plus: Incremental shares underlying dilutive “in the money” warrants outstanding
691,797

 
443,290

 
230,599

 
279,120

Denominator for diluted loss per share
43,712,918

 
41,300,105

 
41,829,231

 
41,045,861

Diluted net loss per common share
$
(0.07
)
 
$
(0.17
)
 
$
(0.44
)
 
$
(0.60
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following potentially dilutive securities have been excluded from the computations of diluted weighted-average shares outstanding, as their effect would be anti-dilutive: 
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
“In the money” stock options
2,733,864

 
35,000

 
1,923,926

 
741,000

“Out of the money” stock options
457,480

 
2,231,200

 
1,113,960

 
1,571,546

“In the money” warrants
—

 
—

 
801,132

 
400,566

“Out of the money” warrants
4,741,725

 
4,831,352

 
4,801,476

 
4,831,352

 
 
 
 
 
 
 
 
Other securities excluded from the calculation of diluted loss per share:
 
 
 
 
 
 
 
Stock options with performance condition
—

 
—

 
66,667

 
—