Commitments and Contingencies (Textual) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 extension
Commitments and Contingencies [Line Items]
Asset retirement obligations	$ 0.1
Estimated obligation payable	0.6
Sixth Amendment [Member]
Commitments and Contingencies [Line Items]
Letters of credit	$ 0.7
Headquarters, Redwood City [Member] | Fifth Amendment [Member]
Commitments and Contingencies [Line Items]
Lease area space occupancy (square feet)	107,000
Penobscot Space, Building 2 Space, and Saginaw Space [Member] | Fifth Amendment [Member]
Commitments and Contingencies [Line Items]
Expiration date of lease	Jan. 31, 2020
Number of extensions available on lease (extension)	2
Extended term of lease (years)	5 years
Chesapeake Space [Member] | Sixth Amendment [Member]
Commitments and Contingencies [Line Items]
Expiration date of lease	Jan. 31, 2013
Number of extensions available on lease (extension)	2
Extended term of lease (years)	5 years
Extended expiration date of lease	Jan. 31, 2017
Dyadic [Member]
Commitments and Contingencies [Line Items]
Contract termination period (days)	60 days