Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Useful Lives of Property and Equipment

Property and equipment are recorded at cost and depreciated or amortized on a straight-line basis over the estimated useful lives of the assets, which are as follows:

Computer equipment	3 years
Purchased and internally developed software	3 – 5 years
Leasehold improvements	Shorter of useful life or life of lease
Machinery, furniture and fixtures	3 – 6 years