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Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2013
Sunnyvale Facility
Subsequent Event
sqft
Dec. 15, 2009
Sunnyvale Facility, Original agreement
sqft
Nov. 04, 2011
Sunnyvale Facility, First Amended
sqft
Jan. 31, 2013
Sunnyvale Facility, Third Amended
Subsequent Event
sqft
Subsequent event        
Reduced space area       31,000
Total space under lease (in square feet) 125,000 125,000 31,000  
Termination and broker fees $ 1.4