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Common Stock and Warrants - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 12, 2015 | Jul. 31, 2015 | Jul. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 38,598,618 | 38,446,000 |
Proceeds from issuance of common stock, net |  |  |  |  | $ 183,897,000 |
Warrants outstanding |  |  |  | 0 | 0 |
Number of warrants exercised during period |  |  |  |  | 383,000 | 11,000
Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, (in shares) |  |  |  |  | 7,353,000 |
IPO | Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, (in shares) |  | 5,227,273 |  |  |  |
Public offering net price per share |  | $ 27.50 | $ 27.50 |  |  |
Net proceeds from offering |  | $ 134,900,000 |  |  |  |
Over-Allotment Option | Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, (in shares) |  | 681,818 |  |  |  |
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 |  |  |
Maximum | Cowen |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock sales agreement aggregate sales proceeds | $ 90,000,000 |  |  |  |  |
Commission on gross sales proceeds of common stock | 3.00% |  |  |  |  |

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