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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 Customer | Dec. 31, 2011 Customer | Dec. 31, 2010 | Aug. 31, 2009 2009 Unit Offering Warrant | Nov. 30, 2010 2010 Unit Offering Warrant | Dec. 31, 2012 Maximum | Dec. 31, 2012 Minimum | Dec. 31, 2011 Minimum | Dec. 31, 2012 Minimum Available-for-sale Securities
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Deferred revenue | $ 77,000 | $ 111,000 |  |  |  |  |  |  |
Highly liquid investments, original maturities |  |  |  |  |  | 3 months |  |  |
Short-term investments, original maturities |  |  |  |  |  | 1 year | 3 months |  | 1 year
Number of major customers representing outstanding trade receivables | 3 | 2 |  |  |  |  |  |  |
Cumulative outstanding trade receivables percentage by major customers | 59.00% | 58.00% |  |  |  |  | 10.00% | 10.00% |
Life of inventory | 2 years |  |  |  |  |  |  |  |
Protracted length of inventory | P1Y |  |  |  |  |  |  |  |
Inventory valuation reserves | 300,000 | 600,000 |  |  |  |  |  |  |
Unsalable product having offsetting warranty claim | 1,700,000 | 0 |  |  |  |  |  |  |
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 |  |  |  |  |  |
Foreign currency gains (losses) | 86,000 | (529,000) | (816,000) |  |  |  |  |  |
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 |  |  |  |  |  | 2012 | 1998 |  |
Unrecognized Tax Benefits | 0 | 0 |  |  |  |  |  |  |
Period of warranty | 1 year |  |  |  |  |  |  |  |
Warrants obligation provided | 900,000 |  |  |  |  |  |  |  |
Product warranty receivable current | $ 1,800,000 |  |  |  |  |  |  |  |

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