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Common Stock - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |  |  |
Common stock, shares outstanding |  |  | 60,587,000 | 38,599,000
Proceeds from issuance of common stock, net |  |  | $ 169,187 |
Underwritten Public Offering | Common Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Issuance of common stock (in shares) | 5,750,000 |  |  |
Net proceeds from Issuance public offering | $ 80,800 |  |  |
At the Market Sales Agreement |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Issuance of common stock (in shares) |  | 15,997,202 |  |
Proceeds from issuance of common stock, net |  | $ 88,200 |  |
Agreement Termination period |  | 2017-06 |  |

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