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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Summary of Warrant Activity

The following is a summary of warrant activity for the six months ended June 30, 2018:

 

 

Number of Shares

 

 

Weighted Average

 

 

 

Underlying Warrants

 

 

Exercise Price

 

Outstanding — December 31, 2017

 

 

1,751,708

 

 

$

6.46

 

Exercised

 

 

(1,735,419

)

 

$

5.50

 

Forfeited

 

 

(4,250

)

 

$

5.50

 

Outstanding — June 30, 2018

 

 

12,039

 

 

$

145.11