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Net Income (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of the Numerators and Denominators of Basic and Diluted Net Loss Per Common Share

The following is a reconciliation of the numerators and denominators of basic and diluted net loss per common share:

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Numerator:

 

 

 

 

 

 

 

 

 

 

 

 

Net loss used to compute net loss per common share:

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

$

(30,704

)

 

$

(22,997

)

 

$

(15,752

)

Adjustment for change in fair value of liability classified stock options

 

 

(187

)

 

 

—

 

 

 

—

 

Diluted

 

$

(30,891

)

 

$

(22,997

)

 

$

(15,752

)

Denominator:

 

 

 

 

 

 

 

 

 

 

 

 

Weighted average number of common shares:

 

 

 

 

 

 

 

 

 

 

 

 

Basic

 

 

17,985,061

 

 

 

15,493,474

 

 

 

14,281,837

 

Adjustment for dilutive effect of stock options

 

 

16,698

 

 

 

—

 

 

 

—

 

Diluted

 

 

18,001,759

 

 

 

15,493,474

 

 

 

14,281,837

 

Net loss per common share - basic

 

$

(1.71

)

 

$

(1.48

)

 

$

(1.10

)

Net loss per common share - diluted

 

$

(1.72

)

 

$

(1.48

)

 

$

(1.10

)