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Summary of Significant Accounting Policies (Details Textual) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 NumberOfCustomers | Sep. 30, 2011 | Sep. 30, 2012 NumberOfCustomers | Sep. 30, 2011 | Dec. 31, 2011 NumberOfCustomers | Aug. 31, 2009 2009 Unit Offering [Member] Warrant [Member] | Nov. 30, 2010 2010 Unit Offering [Member] Warrant [Member] | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Minimum [Member] | Dec. 31, 2011 Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Immaterial prior period adjustments to cost of product revenue |  | $ 100,000 |  | $ 300,000 |  |  |  |  |  |
Deferred revenue | 716,000 |  | 716,000 |  | 111,000 |  |  |  |  |
Number of major customers representing outstanding trade receivables | 3 |  | 3 |  | 2 |  |  |  |  |
Cumulative outstanding trade receivables percentage by major customers | 69.00% |  | 69.00% |  | 58.00% |  |  |  | 10.00% | 10.00%
Inventory valuation reserves | 300,000 |  | 300,000 |  | 600,000 |  |  |  |  |
Unsalable product having offsetting warranty claim | 1,100,000 |  | 1,100,000 |  |  |  |  |  |  |
Estimated useful life of property and equipment |  |  |  |  |  |  |  | 5 years | 3 years |
Estimated useful life of intangible assets |  |  | 10 years |  |  |  |  |  |  |
Impairment charges on long-lived assets | 0 | 0 | 0 | 0 |  |  |  |  |  |
Foreign currency gains (losses) | 206,000 | (41,000) | (212,000) | 394,000 |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock |  |  |  |  |  | 2.4 | 3.7 |  |  |
Derecognition of tax positions, Maximum |  |  |  |  |  |  |  | 50.00% |  |
Company's tax years subject to examination by the taxing jurisdictions |  |  |  |  |  |  |  | 2011 | 2007 |
Product warranty liability | 70,000 |  | 70,000 |  | 0 |  |  |  |  |
Product warranty receivable current | $ 1,700,000 |  | $ 1,700,000 |  |  |  |  |  |  |
Life of inventory |  |  | 2 years |  |  |  |  |  |  |
Protracted length of inventory |  |  | P1Y |  |  |  |  |  |  |
Period of warranty |  |  | 1 year |  |  |  |  |  |  |

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