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Net Income (Loss) per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
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,
 
2017
 
2016
 
2017
 
2016
Net income (loss) attributable to ION
$
4,935

 
$
1,699

 
$
(28,848
)
 
$
(58,657
)
Weighted average number of common shares outstanding
11,890

 
11,786

 
11,862

 
11,269

Effect of dilutive stock awards
181

 
121

 
—

 
—

Weighted average number of diluted common shares outstanding
12,071

 
11,907

 
11,862

 
11,269

 
 
 
 
 
 
 
 
Basic net income (loss) per share
$
0.42

 
$
0.14

 
$
(2.43
)
 
$
(5.21
)
Diluted net income (loss) per share
$
0.41

 
$
0.14

 
$
(2.43
)
 
$
(5.21
)