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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2016
Accounting Policies [Abstract]  
Schedule of Computation of Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share:
 
 
Three Months
Ended March 31,
 
2016
 
2015
Numerator: Net loss attributable to common shareholders
$
(10,268,578
)
 
$
(7,180,441
)
Adjustment for change in fair value of derivative instruments - warrants
(533,750
)
 
—

Net loss used for diluted loss per share
$
(10,802,328
)
 
$
(7,180,441
)
Denominator for basic and diluted net loss per share:
 
 
 
Weighted average shares used to compute basic loss per share
29,755,184

 
21,817,710

Adjustments to reflect assumed exercise of warrants
353,193

 
—

Weighted average shares used to compute diluted net loss per share
30,108,377

 
21,817,710

Net loss per share attributable to common stockholders:
 
 
 
Basic
$
(0.35
)
 
$
(0.33
)
Diluted
$
(0.36
)
 
$
(0.33
)
Schedule of Antidilutive Securities Excluded from the Calculation of Diluted Net Loss per Share
The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted net loss per share because their effect was anti-dilutive:
 
 
March 31,
 
2016
 
2015
Options to purchase Common Stock
8,117,024

 
5,875,138

Warrants to purchase Common Stock
4,515,947

 
5,993,952

Series A Convertible Preferred Stock
63,125

 
63,125

 
12,696,096

 
11,932,215