Commitments (Details) (USD $)	12 Months Ended				12 Months Ended	53 Months Ended	12 Months Ended	53 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Dec. 31, 2012 Lease- Mountain View, CA 590 Middlefield road [Member]	Jun. 30, 2012 Lease- Mountain View, CA 590 Middlefield road [Member] sqft	Dec. 31, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member]	Jun. 30, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member] sqft	Dec. 31, 2012 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member] sqft	Dec. 31, 2012 lease - Leeds, United Kingdom [Member]
Operating Leases, Rent Expense	$ 5,700,000	$ 3,300,000	$ 3,600,000
Operating Leases, Income Statement, Sublease Revenue		500,000
property subject to operating lease, net rentable area						100,000		46,000	132,500
property subject to operating lease term duration						10 years		60 months
Operating Leases, Rent Expense, Minimum Rentals						40,000,000		1,800,000	3,900,000	1,200,000
property subject to lease, original term									12 years	10 years
Lease Expiration Date										Jun. 08, 2021
property subject to lease, 1st extension term duration					60 months		60 months		60 months	0
Purchase Commitment, Remaining Minimum Amount Committed				7,100,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	5,602,000
2014	5,367,000
2015	5,188,000
2016	4,909,000
2017	4,218,000
Thereafter	20,303,000
Total	$ 45,587,000