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Preferred Stock, Common Stock and Warrants - Additional Information (Detail) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 26, 2015 shares | Nov. 10, 2014 USD ($) | Jun. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2014 $ / shares shares
Class Of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized |  |  | 5,000,000 | 5,000,000
Preferred stock, par value | $ / shares |  |  | $ 0.001 | $ 0.001
Common stock, shares outstanding |  |  | 30,237,147 | 26,307,000
Proceeds from issuance of common stock, net | $ |  |  | $ 20,213,000 |
Warrants to purchase common stock |  |  | 0 |
Number of warrants exercised during period |  |  | 1,060,000 |
Cowen |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Issuance of common stock, (in shares) |  |  | 929,590 |
Proceeds from issuance of common stock, net | $ |  |  | $ 20,200,000 |
Maximum | Cowen |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock sales agreement aggregate sales proceeds | $ |  | $ 50,000,000 |  |
Commission on gross sales proceeds of common stock |  | 3.00% |  |
Common Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Convertible common stock shares | 2,600,000 |  |  |
Warrant |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Issuance of common stock, (in shares) |  |  | 375,000 |
Series B Convertible Preferred Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Preferred stock, shares outstanding |  |  | 17,430 | 43,000
Preferred stock, par value | $ / shares |  |  | $ 0.001 |
Convertible common stock shares | 26,000 |  |  |
Convertible common stock shares |  |  | 0.01 |
Conversion of stock, shares converted |  |  | 100 |
Convertible preferred stock, terms of conversion |  |  | The holder is prohibited from converting the Series B Convertible Preferred Stock into shares of common stock if, as a result of such conversion, the holder and its affiliates would own more than 9.98% of the total number of shares of common stock then issued and outstanding. |
Convertible preferred stock, settlement terms |  |  | In the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Convertible Preferred Stock will receive a payment equal to $0.001 per share before any proceeds are distributed to the common stockholders. |
Series B Convertible Preferred Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Maximum percentage of shares of common stock issued and outstanding from conversion of preferred stock |  |  | 9.98% |

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