Summary of Business and Significant Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2012
Computer equipment and software [Member] | Maximum [Member]
Property and equipment estimated useful lives
Property and Equipment useful lives	5 years
Computer equipment and software [Member] | Minimum [Member]
Property and equipment estimated useful lives
Property and Equipment useful lives	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property and equipment estimated useful lives
Property and Equipment useful lives	5 years
Furniture and Fixtures [Member] | Minimum [Member]
Property and equipment estimated useful lives
Property and Equipment useful lives	3 years
Leasehold Improvements [Member]
Property and equipment estimated useful lives
Property and Equipment useful lives	Shorter of the lease term or estimated useful life