Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies

Schedule of useful life of property plant and equipment

Computer equipment and software	3 to 5 years
Leasehold improvements	Shorter of useful life or end of lease term
Furniture and fixtures	3 to 5 years
Telephone system	3 to 5 years

Schedule of useful life of other intangible assets

Purchased technology	4 to 6 years
Customer relationships	4 to 8 years
Other intangibles	3 to 7 years