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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 Customer | Sep. 30, 2012 | Sep. 30, 2013 Customer | Sep. 30, 2012 | Dec. 31, 2012 Customer | Sep. 30, 2013 Product Warranty | Dec. 31, 2012 Product Warranty | Aug. 31, 2009 2009 Unit Offering Warrant | Nov. 30, 2010 2010 Unit Offering Warrant | Sep. 30, 2013 Maximum | Sep. 30, 2013 Minimum | Dec. 31, 2012 Minimum
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | $ 111,000 |  | $ 111,000 |  | $ 77,000 |  |  |  |  |  |  |
Number of major customers representing outstanding trade receivables | 3 |  | 3 |  | 3 |  |  |  |  |  |  |
Cumulative outstanding trade receivables percentage by major customers |  |  | 55.00% |  | 59.00% |  |  |  |  |  | 10.00% | 10.00%
Life of inventory |  |  | 2 years |  |  |  |  |  |  |  |  |
Protracted length of inventory |  |  | 1 year |  |  |  |  |  |  |  |  |
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) | 409,000 | 187,000 | 198,000 | (53,000) |  |  |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock |  |  |  |  |  |  |  | 2.4 | 3.7 |  |  |
Company's tax years subject to examination by the taxing jurisdictions |  |  |  |  |  |  |  |  |  | 2012 | 1998 |
Unrecognized Tax Benefits | 0 |  | 0 |  | 0 |  |  |  |  |  |  |
Warranty claim | 394,000 |  | 394,000 |  | 2,038,000 | 0 | 1,800,000 |  |  |  |  |
Inventory write down |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |
Period of warranty |  |  | 1 year |  |  |  |  |  |  |  |  |

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