Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Fifth Amendment [Member]
Dec. 31, 2012
Fifth Amendment [Member]
Mar. 31, 2013
Penobscot Space, Building 2 Space, and Saginaw Space [Member]
Fifth Amendment [Member]
extensions
Mar. 31, 2013
Headquarters, Redwood City [Member]
Fifth Amendment [Member]
sqft
Mar. 16, 2011
Saginaw Space [Member]
Fifth Amendment [Member]
sqft
Mar. 31, 2013
Chesapeake Space [Member]
Sixth Amendment [Member]
extensions
Mar. 31, 2013
Singapore [Member]
Dec. 31, 2012
Singapore [Member]
Commitments and Contingencies [Line Items]                      
Lease area space occupancy (in square feet)             107,000 29,921      
Expiration date of lease           Jan. 31, 2020     Jan. 31, 2013    
Number of extensions available on lease           2     2    
Extended term of lease           5 years          
Initial time period for forgiveness of rent payments (in 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         3,200,000            
Extended expiration date of lease                 Jan. 31, 2017    
Letters of credit         707,000            
Accrued Rent                   0 0
Asset retirement obligations 109,000   109,000                
Accretion of asset retirement obligations 0 7,000                  
Estimated obligation payable $ 600,000