Three months ended June 30,

Six months ended June 30,

2012

2011

2012

2011

Numerator:

Net income

$

6,592

$

3,482

$

9,587

$

5,375

Denominator:

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

34,665

33,846

34,385

34,432

Effect of dilutive securities

1,332

1,057

1,275

1,166

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

35,997

34,903

35,660

35,598

Net income per share - basic

$

0.19

$

0.10

$

0.28

$

0.16

Net income per share - diluted

$

0.18

$

0.10

$

0.27

$

0.15