RECONCILIATION OF OPERATING EXPENSES TO NON-GAAP OPERATING EXPENSES

(Unaudited, in thousands)

Three months ended

June 30,

Six months ended

June 30,

2013

2012

2013

2012

Total operating expenses

$ 26,014

$ 24,391

$   51,094

$   47,603

Adjustments to reconcile total operating expenses to non-GAAP total operating expenses:

    Stock-based compensation

$ (5,044)

$ (3,711)

$   (9,548)

$   (6,931)

    Non-GAAP operating expenses

$ 20,970

$ 20,680

$   41,546

$   40,672

RECONCILIATION OF OPERATING INCOME TO NON-GAAP OPERATING INCOME

(Unaudited, in thousands)

Three months ended

June 30,

Six months ended

June 30,

2013

2012

2013

2012

Total operating income

$   4,914

$   6,781

$   7,219

$   9,979

   Operating income as a percentage of revenue

8.5%

11.6%

6.6%

9.1%

Adjustments to reconcile total operating income to non-GAAP total operating income:

   Stock-based compensation

$   5,190

$   3,829

$   9,850

$   7,144

   Non-GAAP operating income

$ 10,104

$ 10,610

$ 17,069

$ 17,123

      Non-GAAP operating income as a percentage of revenue

17.5%

18.1%

15.6%

15.7%