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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 |  |  |  |

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- Definition Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 86 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section 7 -Paragraph 14 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386783&loc=d3e4542-108314 + Details
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