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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Basic and diluted net income per share
The following table sets forth the calculation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
118

 
$
(576
)
 
$
3,097

 
$
917

Income (loss) from discontinued operations, net of income taxes
—

 
—

 
—

 
1,938

Net income
$
118

 
$
(576
)
 
$
3,097

 
$
2,855

Denominator:
 
 
 
 
 
 
 
Weighted average common shares—basic
12,314

 
12,628

 
12,412

 
13,023

Effect of dilutive securities: stock options
349

 
—

 
218

 
17

Weighted average common shares—diluted
12,663

 
12,628

 
12,630

 
13,040

Income (loss) per share—basic:
 
 
 
 
 
 
 
Continuing operations
$
0.01

 
$
(0.05
)
 
$
0.25

 
$
0.07

Discontinued operations
—

 
—

 
—

 
0.15

Net income (loss) per share—basic
$
0.01

 
$
(0.05
)
 
$
0.25

 
$
0.22

Income (loss) per share—diluted:
 
 
 
 
 
 
 
Continuing operations
$
0.01

 
$
(0.05
)
 
$
0.25

 
$
0.07

Discontinued operations
—

 
—

 
—

 
0.15

Net income (loss) per share—diluted
$
0.01

 
$
(0.05
)
 
$
0.25

 
$
0.22