Three months ended September 30,

Nine months ended September 30,

2012

2011

2012

2011

Numerator:

Net income

$

5,921

$

5,473

$

15,508

$

10,848

Denominator:

Weighted average outstanding shares used to compute basic net income per share

35,145

33,594

34,677

34,149

Effect of dilutive securities

1,293

646

1,331

1,126

Weighted average outstanding shares used to compute diluted net income per share

36,438

34,240

36,008

35,275

Net income per share - basic

$

0.17

$

0.16

$

0.45

$

0.32

Net income per share - diluted

$

0.16

$

0.16

$

0.43

$

0.31