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Loss Per Common Share
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Loss Per Common Share
Loss Per Common Share
Basic loss per common share is calculated by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted loss per common share is calculated using the treasury share method by giving effect to all potentially dilutive securities that were outstanding. Potentially dilutive options and warrants to purchase common stock that were outstanding during the periods presented were excluded from the diluted loss per share calculation because such shares had an anti-dilutive effect due to the net loss reported in those periods. Therefore, basic and diluted loss per common share is the same for each of the three months ended March 31, 2018 and 2017.
The following is the computation of loss per common share for the three months ended March 31, 2018 and 2017:
 
Three Months Ended
March 31,
 
2018
 
2017
Net loss
$
(5,509
)
 
$
(2,652
)
Weighted-average basic and diluted common shares outstanding
39,357,289

 
169,794

Loss per share - basic and diluted
$
(0.14
)
 
$
(15.62
)

The outstanding securities presented below were excluded from the calculation of net loss per common share, because such securities would have been anti-dilutive due to the Company’s net loss per share during the periods ending on the dates presented:
 
 
March 31,
 
 
2018
 
2017
Options to purchase common stock
 
4,335,729

 
3,683,826

Warrants to purchase common stock
 
413,320

 
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