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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Calculations of Net Loss Per Share
The calculations of net loss per share were as follows:
   
Three months ended June 30,
 
Six months ended June 30,
   
2018
 
2017
 
2018
 
2017
 
(Unaudited - In thousands, except per share data)
Basic:
   
 
   
 
   
 
   
Net loss
$
(24,896
)
 
$
(29,097
)
 
$
(31,066
)
 
$
(51,194
)
Weighted average common shares outstanding
20,539

 
20,411

 
20,523

 
20,395

Net loss per share
$
(1.21
)
 
$
(1.43
)
 
$
(1.51
)
 
$
(2.51
)
 
 
 
 
 
 
 
 
Diluted:
 
 
 
 
 
 
 
Net loss
$
(24,896
)
 
$
(29,097
)
 
$
(31,066
)
 
$
(51,194
)
Weighted average common shares outstanding
20,539

 
20,411

 
20,523

 
20,395

Net loss for dilutive share computation
$
(1.21
)
 
$
(1.43
)
 
$
(1.51
)
 
$
(2.51
)