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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Basic and diluted net income (loss) per common share
The following table summarizes the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2018
 
2017
 
2018
 
2017
Net income (loss) attributable to ION
$
(7,536
)
 
$
4,935

 
$
(51,828
)
 
$
(28,848
)
Weighted average number of common shares outstanding
14,003

 
11,890

 
13,586

 
11,862

Effect of dilutive stock awards
—

 
181

 
—

 
—

Weighted average number of diluted common shares outstanding
14,003

 
12,071

 
13,586

 
11,862

 
 
 
 
 
 
 
 
Basic net income (loss) per share
$
(0.54
)
 
$
0.42

 
$
(3.81
)
 
$
(2.43
)
Diluted net income (loss) per share
$
(0.54
)
 
$
0.41

 
$
(3.81
)
 
$
(2.43
)