Commitments rented properties data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	53 Months Ended	3 Months Ended	12 Months Ended	53 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2011 Lease- Mountain View, CA 590 Middlefield road [Member] sqft	Dec. 31, 2012 Lease- Mountain View, CA 590 Middlefield road [Member]	Jun. 30, 2012 Lease- Mountain View, CA 590 Middlefield road [Member]	Mar. 31, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member] sqft	Dec. 31, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member]	Jun. 30, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member]	Mar. 31, 2013 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]	Jun. 30, 2012 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member] sqft	Dec. 31, 2012 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]	Mar. 31, 2013 lease - Leeds, United Kingdom [Member]	Jun. 30, 2012 lease - Leeds, United Kingdom [Member] sqft
Operating Leased Assets [Line Items]
Document Period End Date	Mar. 31, 2013
property subject to operating lease, net rentable area		100,000			46,000				132,500			16,500
property subject to operating lease term duration				10 years			60 months
Operating Leases, Rent Expense, Minimum Rentals				$ 40.0			$ 1.8	$ 3.9			$ 1.2
property subject to lease, 1st extension term duration								12 years			10 years
Property subject to operating lease, 2nd extension term duration			60 months							60 months
Lease Expiration Date											Jun. 08, 2021
property subject to lease, 1st extension term duration			60 months			60 months				60 months	0