Three months ended June 30,

Six months ended June 30,

2013

2012

2013

2012

Numerator:

Net income

$

5,489

$

6,592

$

7,989

$

9,587

Denominator:

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

37,053

34,665

36,657

34,385

Effect of dilutive securities

1,186

1,332

1,362

1,275

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

38,239

35,997

38,019

35,660

Net income per share - basic

$

0.15

$

0.19

$

0.22

$

0.28

Net income per share - diluted

$

0.14

$

0.18

$

0.21

$

0.27