Three months ended September 30,

Nine months ended September 30,

2013

2012

2013

2012

Numerator:

Net income

$

7,410

$

5,921

$

15,399

$

15,508

Denominator:

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

37,910

35,145

37,079

34,677

Effect of dilutive securities

1,099

1,293

1,340

1,331

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

39,009

36,438

38,419

36,008

Net income per share - basic

$

0.20

$

0.17

$

0.42

$

0.45

Net income per share - diluted

$

0.19

$

0.16

$

0.40

$

0.43