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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Calculations of Net Loss Per Share
The calculations of net loss per share were as follows:
   
Three months ended March 31,
   
2018
 
2017
 
(Unaudited - In thousands, except per share data)
Basic:
   
 
   
Net loss
$
(6,170
)
 
$
(22,097
)
Weighted average common shares outstanding
20,506

 
20,380

Net loss per share
$
(0.30
)
 
$
(1.08
)
 
 
 
 
Diluted:
 
 
 
Net loss
$
(6,170
)
 
$
(22,097
)
Weighted average common shares outstanding
20,506

 
20,380

Net loss for dilutive share computation
$
(0.30
)
 
$
(1.08
)