Commitments and Contingencies (Textual) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended			9 Months Ended
	Mar. 31, 2014 extension	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2012 Fifth Amendment [Member]	Sep. 30, 2014 Sixth Amendment [Member]	Sep. 30, 2014 Headquarters, Redwood City [Member] Fifth Amendment [Member] sqft	Sep. 30, 2014 Penobscot Space, Building 2 Space, and Saginaw Space [Member] Fifth Amendment [Member]	Sep. 30, 2014 Chesapeake Space [Member]
Commitments and Contingencies [Line Items]
Lease area space occupancy (square feet)						107,000
Expiration date of lease							Jan. 31, 2020	Jan. 31, 2017
Payments for Capital Improvements				$ 3.6
Tenant Reimbursements				3.1
Incentive from Lessor		1.8	1.8
Term of sublease	3 years
Number of sublease renewal options	2
Term of sublease renewal	1 year
Sublease income		0.1	0.2
Letters of credit					0.7
Asset retirement obligations		0.1	0.1
Estimated obligation payable		$ 0.6	$ 0.6