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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Diluted Net Loss Per Share
The following tables reconcile the components of the numerator and denominator included in the calculations of diluted net loss per share:
 
Three Months Ended June 30,
 
2019
 
2018
Numerator
 
 
 
Net loss
$
(29,387,226
)
 
$
(6,639,125
)
Adjustment for decrease in fair value of warrant liability
—

 
(259,971
)
Numerator for use in diluted net loss per share
$
(29,387,226
)
 
$
(6,899,096
)
 
 
 
 
Denominator
 
 
 
Weighted average number of common shares outstanding
98,083,896

 
91,153,776

Effect of dilutive potential common shares
—

 
87,884

Denominator for use in diluted net loss per share
98,083,896

 
91,241,660

 
 
 
 
Net loss per share, diluted
$
(0.30
)
 
$
(0.08
)
 
Six Months Ended June 30,
 
2019
 
2018
Numerator
 
 
 
Net loss
$
(58,606,488
)
 
$
(38,989,953
)
Adjustment for decrease in fair value of warrant liability
—

 
(132,130
)
Numerator for use in diluted net loss per share
$
(58,606,488
)
 
$
(39,122,083
)
 
 
 
 
Denominator
 
 
 
Weighted average number of common shares outstanding
97,795,910

 
90,804,722

Effect of dilutive potential common shares
—

 
86,070

Denominator for use in diluted net loss per share
97,795,910

 
90,890,792

 
 
 
 
Net loss per share, diluted
$
(0.60
)
 
$
(0.43
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table summarizes potential shares of common stock that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect for the three and six months ended June 30, 2019 and 2018:
 
 
Common Stock Equivalents
2019
 
2018
Options to purchase common stock
10,770,319

 
9,245,981

Restricted stock units
1,580,192

 
1,760,710

Convertible preferred stock
8,456

 
8,456

Convertible notes
14,585,653

 
—

Total
26,944,620

 
11,015,147