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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 Customer | Jun. 30, 2012 | Jun. 30, 2013 Customer | Jun. 30, 2012 | Dec. 31, 2012 Customer | Jun. 30, 2013 Product Warranty | Dec. 31, 2012 Product Warranty | Aug. 31, 2009 2009 Unit Offering Warrant | Nov. 30, 2010 2010 Unit Offering Warrant | Jun. 30, 2013 Maximum | Jun. 30, 2013 Minimum | Dec. 31, 2012 Minimum | Jun. 30, 2013 Minimum Available-for-sale Securities
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | $ 153,000 |  | $ 153,000 |  | $ 77,000 |  |  |  |  |  |  |  |
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 | 4 |  | 4 |  | 3 |  |  |  |  |  |  |  |
Cumulative outstanding trade receivables percentage by major customers | 64.00% |  | 64.00% |  | 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) | (157,000) | (611,000) | (211,000) | (240,000) |  |  |  |  |  |  |  |  |
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 |  | 0 |  |  |  |  |  |  |  |
Current asset, warrant claim | 200,000 |  | 200,000 |  | 2,038,000 | 0 | 1,800,000 |  |  |  |  |  |
Inventory write down |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |
Period of warranty |  |  | 1 year |  |  |  |  |  |  |  |  |  |

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