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Common Stock - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 03, 2017 | Aug. 31, 2017 | Feb. 22, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |  |  |  |
Common stock, shares outstanding |  |  |  | 62,862,478 | 61,533,000
Net cash proceeds received |  |  |  |  | $ 185,936,000
Common Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 22,588,000
2017 ATM Agreement |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 840,774
Net cash proceeds received |  |  |  |  | $ 16,900,000
Remaining proceeds from common stock, under sales agreement |  |  |  | $ 132,800,000 |
2017 ATM Agreement | Subsequent Event |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  | 1,078,901 |  |
Net cash proceeds received |  |  | $ 11,500,000 |  |
Underwritten Public Offering | Common Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  | 5,750,000 |  |  |
Public offering net price per share |  | $ 15.00 |  |  |
Net proceeds from offering |  | $ 80,800,000 |  |  |
Over-Allotment Option | Common Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  | 750,000 |  |  |
2015 ATM Agreement |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 15,997,202
Net cash proceeds received |  |  |  |  | $ 88,200,000
Maximum | 2017 ATM Agreement |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock sales agreement aggregate sales proceeds | $ 150,000,000 |  |  |  |
Commission on gross sales proceeds of common stock | 3.00% |  |  |  |

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