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Summary of Significant Accounting Policies (Details 2) (USD $)
 9 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2012
segment
area
item
Dec. 31, 2011
item
Dec. 31, 2009
Dec. 31, 2010
Dec. 31, 2010
Cambridge facility
Dec. 31, 2009
Cambridge facility
Dec. 31, 2011
Property, plant and equipment
Minimum
Dec. 31, 2011
Property, plant and equipment
Maximum
Dec. 31, 2011
Leasehold improvements
Minimum
Dec. 31, 2011
Leasehold improvements
Maximum
Segments                    
Number of operating segments 1 1                
Number of geographic areas for development operations 2 2                
Trade Accounts Receivable and Allowance for Doubtful Accounts                    
Trade accounts receivable   $ 100,000   $ 100,000            
Inventory                    
Write-down of inventory     100,000              
Property, plant and equipment                    
Estimated useful life             3 years 5 years 5 years 15 years
Fixed assets sold   $ 6,000     $ 28,000 $ 100,000