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Preferred Stock, Common Stock and Warrants - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 12, 2015 USD ($) | Jul. 23, 2015 shares | Feb. 26, 2015 shares | Nov. 04, 2008 $ / shares | Jul. 31, 2015 USD ($) $ / shares shares | Jul. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) 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 |  | $ 0.001
Common stock, par value | $ / shares |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001
Dividends payable date |  |  |  | Nov. 17, 2008 |  |  |  |  |
Preferred shares price | $ / shares |  |  |  | $ 6.00 |  |  |  |  |
Rights expiration date |  |  |  | Nov. 17, 2018 |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  | 38,445,995 |  | 26,307,000
Proceeds from issuance of common stock, net | $ |  |  |  |  |  |  | $ 183,897,000 | $ 80,856,000 |
Warrants outstanding |  |  |  |  |  |  | 0 |  |
Number of warrants exercised during period |  |  |  |  |  |  | 383,000 |  | 11,000
Cowen |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock, (in shares) |  |  |  |  |  | 2,125,439 | 0 |  |
Proceeds from issuance of common stock, net | $ |  |  |  |  |  | $ 49,000,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Percentage of common shares outstanding |  |  |  | 20.00% |  |  |  |  |
Percentage of assets |  |  |  | 50.00% |  |  |  |  |
Maximum | Cowen |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock sales agreement aggregate sales proceeds | $ | $ 90,000,000 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Convertible common stock shares |  | 1,743,000 | 2,600,000 |  |  |  |  |  |
Issuance of common stock, (in shares) |  |  |  |  |  |  | 7,353,000 | 7,957,000 |
Common Stock | IPO |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock, (in shares) |  |  |  |  | 5,227,273 |  |  |  |
Public offering net price per share | $ / shares |  |  |  |  | $ 27.50 | $ 27.50 |  |  |
Net proceeds from offering | $ |  |  |  |  | $ 134,900,000 |  |  |  |
Common Stock | Over-Allotment Option |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock, (in shares) |  |  |  |  | 681,818 |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 0 |  |  |  |  | 0 |  | 43,000
Convertible common stock shares |  | 17,430 | 26,000 |  |  |  |  |  |
Conversion of stock, shares converted |  |  |  |  |  |  | 100 |  |
Convertible common stock shares |  |  |  |  |  |  | 0.01 |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  | $ 0.001 |  |
Convertible preferred stock, terms of conversion |  |  |  |  |  |  | The holder was 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. |  |
Maximum percentage of shares of common stock issued and outstanding from conversion of preferred stock |  |  |  |  |  |  | 9.98% |  |

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