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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2017 and 2016 is as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands, except per share data)
Net income (loss)
$
6,231

 
$
1,983

 
$
(3,686
)
 
$
446

Weighted-average shares outstanding — basic
37,698

 
36,332

 
37,266

 
36,020

Effect of dilutive securities from stock award plans
1,275

 
747

 
—

 
675

Weighted-average shares outstanding — diluted
$
38,973

 
$
37,079

 
37,266

 
36,695

Net income (loss) per share - basic
$
0.17

 
$
0.05

 
$
(0.10
)
 
$
0.01

Net income (loss) per share - diluted
$
0.16

 
$
0.05

 
$
(0.10
)
 
$
0.01

 
 
 
 
 
 
 
 
Anti-dilutive weighted-average shares related to stock award plans
1,383

 
326

 
3,757

 
1,255