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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017 was as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands, except per share data)
Net income (loss)
$
6,588

 
$
1,880

 
$
9,308

 
$
(8,455
)
Weighted-average shares outstanding — basic
38,970

 
37,250

 
38,804

 
37,046

Effect of dilutive securities from stock award plans
1,030

 
1,120

 
1,050

 
—

Weighted-average shares outstanding — diluted
$
40,000

 
$
38,370

 
39,854

 
37,046

Net income (loss) per share - basic
$
0.17

 
$
0.05

 
$
0.24

 
$
(0.23
)
Net income (loss) per share - diluted
$
0.16

 
$
0.05

 
$
0.23

 
$
(0.23
)
 
 
 
 
 
 
 
 
Anti-dilutive weighted-average shares related to stock award plans
1,264

 
2,121

 
1,249

 
4,039