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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Net Income Per Share
The basic and diluted net income (loss) per share calculation for the three and six months ended June 30, 2017 and 2016 is as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands, except per share data)
Net income (loss)
$
837

 
$
(1,159
)
 
$
(9,917
)
 
$
(1,537
)
Weighted-average shares outstanding — basic
37,250

 
35,987

 
37,046

 
35,864

Effect of dilutive securities from stock award plans
1,120

 
—

 
—

 
—

Weighted-average shares outstanding — diluted
$
38,370

 
$
35,987

 
$
37,046

 
35,864

Net income (loss) per share - basic
$
0.02

 
$
(0.03
)
 
$
(0.27
)
 
$
(0.04
)
Net income (loss) per share - diluted
$
0.02

 
$
(0.03
)
 
$
(0.27
)
 
$
(0.04
)
 
 
 
 
 
 
 
 
Anti-dilutive weighted-average shares related to stock award plans
2,121

 
1,961

 
4,039

 
2,037