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Stockholders' Equity (Additional Information) (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2015 | Mar. 18, 2015 | Nov. 18, 2014 | Apr. 10, 2015 | Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | May. 08, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 5,000,000 | 5,000,000 |  | 5,000,000 |
Preferred stock, par value (usd per share) |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Common stock, shares authorized |  | 3,653,846 |  |  | 275,000,000 | 275,000,000 |  | 200,000,000 |
Common stock, par value (usd per share) |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Proceeds from Issuance or Sale of Equity |  | $ 38,000,000 |  |  |  | $ 309,000 | $ 263,000 |  |
Purchase Agreement Term |  |  | 36 months |  |  |  |  |  |
Share Price |  | $ 1.56 |  |  |  |  |  |  |
Issuance of common stock, shares |  | 24,358,974 |  |  |  |  |  |  |
Number of Shares Per Unit |  | 0.50 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 2.08 |  |  |  |  |  |  | $ 2.47
Number of shares availabe from warrants |  | 1,826,923 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Overallotment Option | 3,653,846 | 1,826,923 |  |  |  |  |  |  |
Proceeds From Issuance or Sale of Equity, Net Underwriting Discounts, Commissions and Offering Expenses | $ 5,400,000 |  |  | $ 40,800,000 |  |  |  |  |
Lincoln Park Capital, LLC [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 4,900,000 |  | $ 4,400,000 |  |  |  |
Stock Issued During Period, Shares, Purchase of Assets |  |  | 2,500,000 |  |  |  |  |  |
Share Price |  |  | $ 2.00 |  |  |  |  |  |
Issuance of common stock, shares |  |  |  |  | 2,700,000 |  |  |  |
Lincoln Park Capital, LLC [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  | $ 50,000,000 |  |  |  |  |  |
Issuance of common stock, shares |  |  | 631,221 |  |  |  |  |  |
MLV & Co. LLC and Maxim Group LLC [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  | $ 2,300,000 |  |  |  |
Issuance of common stock, shares |  |  |  |  | 1,400,000 |  |  |  |
At Market Issuance Sales Agreements, Percent of Gross Proceeds |  |  |  |  |  |  |  | 3.00% |
At Market Issuance Sales Agreements, Maximum Gross Proceeds |  |  |  |  |  |  |  | $ 20,000,000 |

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