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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) Customer Segment | Dec. 31, 2014 USD ($) Customer | Dec. 31, 2013 USD ($) | Nov. 30, 2010 shares | Aug. 31, 2009 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue-current | $ 554,000 | $ 376,000 |  |  |
Long-term deferred revenue | $ 100,000 | $ 100,000 |  |  |
Number of major customers representing outstanding trade receivables | Customer | 3 | 1 |  |  |
Life of inventory | 2 years |  |  |  |
Protracted length of inventory | 1 year |  |  |  |
Inventory valuation reserves | $ 1,800,000 | $ 100,000 |  |  |
Estimated useful life of intangible assets | 10 years |  |  |  |
Number of reportable segments | Segment | 1 |  |  |  |
Impairment charges on long-lived assets | $ 0 | 0 | $ 0 |  |
Period of warranty | 1 year |  |  |  |
Warranty claim liability | $ 0 | 0 |  |  |
2009 Warrants |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Warrants to purchase an aggregate shares of common stock | shares |  |  |  |  | 2.4
2010 Warrants |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Warrants to purchase an aggregate shares of common stock | shares |  |  |  | 3.7 |
Computer Software, Intangible Asset |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software, addition | 0 | 1,800,000 |  |  |
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software | $ 1,300,000 | $ 1,600,000 |  |  |
Enterprise resource planning system, estimated useful life | 5 years |  |  |  |
Trade Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage | 49.00% | 36.00% |  |  |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life of property and equipment | 3 years |  |  |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life of property and equipment | 5 years |  |  |  |

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