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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 Segment Customer | Mar. 31, 2013 | Dec. 31, 2013 Customer | Aug. 31, 2009 2009 Unit Offering | Nov. 30, 2010 2010 Unit Offering | Mar. 31, 2014 Trade Accounts Receivable | Dec. 31, 2013 Trade Accounts Receivable | Mar. 31, 2014 Minimum | Mar. 31, 2014 Maximum
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred revenue | $ 279,000 |  | $ 181,000 | [1] |  |  |  |  |  |
Number of major customers representing outstanding trade receivables | 3 |  | 2 |  |  |  |  |  |  |
Cumulative outstanding trade receivables percentage by major customers |  |  |  |  |  |  | 65.00% | 55.00% |  |
Life of inventory | 2 years |  |  |  |  |  |  |  |  |
Protracted length of inventory | 1 year |  |  |  |  |  |  |  |  |
Inventory valuation reserves | 300,000 |  | 400,000 |  |  |  |  |  |  |
Estimated useful life of property and equipment |  |  |  |  |  |  |  |  | 3 years | 5 years
Estimated useful life of intangible assets | 10 years |  |  |  |  |  |  |  |  |
Number of operating segments | 1 |  |  |  |  |  |  |  |  |
Number of reportable segments | 1 |  |  |  |  |  |  |  |  |
Impairment charges on long-lived assets | 0 | 0 |  |  |  |  |  |  |  |
Foreign exchange gain (loss) | $ 100,000 | $ (100,000) |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 1998 | 2013
Period of warranty | 1 year |  |  |  |  |  |  |  |  |
[1] | The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.

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