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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) Customer | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Customer Segment | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) Customer | Nov. 30, 2010 shares | Aug. 31, 2009 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reserves for uncollectible accounts | $ 0 |  | $ 0 |  | $ 0 |  |
Number of major customers representing outstanding trade receivables | Customer | 2 |  | 2 |  | 1 |  |
Life of inventory |  |  | 2 years |  |  |  |
Protracted length of inventory |  |  | 1 year |  |  |  |
Inventory valuation reserves | $ 1,300,000 |  | $ 1,300,000 |  | $ 100,000 |  |
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software | 0 | $ 1,800,000 | $ 0 | $ 1,800,000 |  |  |
Estimated useful life of intangible assets |  |  | 10 years |  |  |  |
Number of reportable segments | Segment |  |  | 1 |  |  |  |
Impairment charges on long-lived assets | 0 | 0 | $ 0 | 0 |  |  |
Tax year subject to examination |  |  | The Company's US federal and California tax years through 2014 remain subject to examination by the taxing jurisdictions due to unutilized net operating losses and research credits. |  |  |  |
Period of warranty |  |  | 1 year |  |  |  |
Warranty claim liability | $ 0 |  | $ 0 |  | $ 0 |  |
Computer Software, Intangible Asset |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Enterprise resource planning system, estimated useful life |  |  | 5 years |  |  |  |
2009 Unit Offering |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock | shares |  |  |  |  |  |  | 2.4
2010 Unit Offering |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock | shares |  |  |  |  |  | 3.7 |
Other income, net |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reclassified amortization of premium from purchase of fixed income securities |  | $ 100,000 |  | $ 300,000 |  |  |
Trade Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  |  | 42.00% |  | 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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