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Net Earnings (Loss) Per Common Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Net Earnings (Loss) Per Common Share
Net Earnings (Loss) Per Common Share
 
Basic earnings per share is calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated by adding the dilutive potential common shares to the weighted average number of common shares that were outstanding during the period. For purposes of the diluted earnings per share calculation, outstanding stock options and restricted stock units are considered common stock equivalents, using the treasury stock method.

The following reflects the net income (loss) attributable to common shareholders and share data used in the basic and diluted earnings per share computations using the treasury class method: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Amounts in thousands except per share amounts)
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 

 
 

 
 

 
 

Net income (loss)
 
$
3,470

 
$
(1,069
)
 
$
(19,166
)
 
$
(13,379
)
Denominator:
 
 

 
 

 
 
 
 

Weighted-average common shares outstanding (basic)
 
44,251

 
42,925

 
43,979

 
39,163

Weighted-average shares outstanding (diluted)
 
46,667

 
42,925

 
43,979

 
39,163

Net income (loss) per share attributable to common shareholders (basic)
 
$
0.08

 
$
(0.02
)
 
$
(0.44
)
 
$
(0.34
)
 
 
 
 
 
 
 
 
 
Net income (loss) per share attributable to common shareholders (diluted)
 
$
0.07

 
$
(0.02
)
 
$
(0.44
)
 
$
(0.34
)
 
 
 
 
 
 
 
 
 
Anti-dilutive shares excluded from the calculation of diluted earnings per share(a):
 
 
 
 
 
 
 
 
Stock options
 
1,619
 
5,196
 
5,116
 
5,196
Restricted stock unit awards
 
—

 
—

 
159
 
—

Warrants
 
—

 
112
 
—

 
112
 
 
 
 
 
 
 
 
 
(a) Common equivalent shares are not included in the diluted per share calculation where the effect of their inclusion would be anti-dilutive.