Three Months Ended June 30,

Six Months Ended June 30,

2012

2011

2012

2011

Numerator:

Net income

$

718

$

509

$

1,025

$

762

Denominator:

Shares used in basic net income per share calculation

20,134

20,012

20,125

19,826

Effect of diluted securities:

Employee stock options

2,186

1,644

2,181

1,561

Shares used in diluted net income per common share calculation

22,320

21,656

22,306

21,387

Basic net income per common share

$

0.04

$

0.03

$

0.05

$

0.04

Diluted net income per common share

$

0.03

$

0.02

$

0.05

$

0.04