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Net Loss per Share
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Net Loss per Share
Net Loss per Share
Basic net loss per common share is computed by dividing net loss applicable to common shares by the weighted average number of common shares outstanding during the period. Diluted net 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 March 31, 2016 and 2015 was 623,902 and 634,818, respectively, and the total number of shares of restricted stock and shares reserved for restricted stock units outstanding at March 31, 2016 and 2015 was 253,738 and 100,298, respectively. The foregoing share numbers have been retroactively adjusted to reflect the one-for-fifteen reverse stock split completed on February 4, 2016. All outstanding stock options for the three months ended March 31, 2016 were anti-dilutive.
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
)