Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Textual) (Details)

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Commitments and Contingencies (Textual) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]    
Remaining minimum lease payments $ 20,604,000  
Asset retirement obligations 109,000 579,000
Accretion of asset retirement obligations 30,000 39,000
Estimated obligation payable 600,000  
Fifth Amendment [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Initial time period for forgiveness of rent payments (months) 2 months  
Tenant improvement allowances 2,400,000  
Special allowances for costs 800,000  
Amount spent for capital improvements 3,600,000  
Reimbursements from landlord 1,300,000 1,800,000
Letters of credit   707,000
Penobscot Space, Building 2 Space, and Saginaw Space [Member] | Fifth Amendment [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Expiration date of lease Jan. 31, 2020  
Number of extensions available on lease (extension) 2  
Extended term of lease (years) 5 years  
Headquarters, Redwood City [Member] | Fifth Amendment [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Lease area space occupancy (in square feet) 107,000  
Saginaw Space [Member] | Fifth Amendment [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Lease area space occupancy (in square feet) 29,921  
Chesapeake Space [Member] | Sixth Amendment [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Expiration date of lease Jan. 31, 2013  
Singapore [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Remaining minimum lease payments $ 354,000  
Facility lease term (months) 6 months