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Loss Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of Loss Per Common Share
The following is the computation of loss per common share for the three and nine months ended September 30, 2017 and 2016:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Net loss
$
(2,313
)
 
$
(3,526
)
 
$
(8,937
)
 
$
(11,299
)
Weighted-average basic and diluted common shares outstanding
1,725,906

 
97,691

 
183,395

 
109,539

Loss per share - basic and diluted
$
(1.34
)
 
$
(36.09
)
 
$
(48.73
)
 
$
(103.15
)
Antidilutive Securities
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:
 
 
September 30,
 
 
2017
 
2016
Options to purchase common stock
 
3,678,359

 
3,038,772

Warrants to purchase common stock
 
163,174

 
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