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Net Loss per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Computation of basic and diluted net loss per common share
The following table summarizes the computation of basic and diluted net loss per common share (in thousands, except per share amounts):
 
Three Months Ended March 31,
 
2016
 
2015
Net loss attributable to ION
$
(35,014
)
 
$
(55,264
)
Weighted average number of common shares outstanding
10,600

 
10,971

Weighted average number of diluted common shares outstanding
10,600

 
10,971

Basic net loss per share
$
(3.30
)
 
$
(5.04
)
Diluted net loss per share
$
(3.30
)
 
$
(5.04
)