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Net Income (Loss) Per Share
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share
Net Income (Loss) Per Share
Basic net income (loss) per common share is computed by dividing net income (loss) applicable to common shares by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is determined based on the assumption that dilutive restricted stock and restricted stock unit awards have vested and outstanding dilutive stock options have been exercised and the aggregate proceeds were used to reacquire common stock using the average price of such common stock for the period. The total number of shares issued or reserved for future issuance under outstanding stock options at September 30, 2018 and 2017 was 804,936 and 782,739, respectively, and the total number of shares of restricted stock and shares reserved for restricted stock units outstanding at September 30, 2018 and 2017 was 128,131 and 163,184, respectively. Except for the three months ended September 30, 2017, the outstanding stock options were anti-dilutive for all periods presented, as reflected in the table below.
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
)