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Common Stock - Additional Information (Detail) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Nov. 03, 2017 | Jun. 30, 2019 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |
Common stock, shares outstanding |  | 65,154,729 | 62,862,000
Net cash proceeds received |  | $ 13,949,000 |
2017 ATM Agreement |  |  |
Class Of Stock [Line Items] |  |  |
Issuance of common stock (in shares) |  | 1,386,906 |
Net cash proceeds received |  | $ 13,900,000 |
Remaining proceeds from common stock, under sales agreement |  | $ 118,600,000 |
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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