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Common Stock - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Overview Of Company [Line Items] |  |  |  |  |
Common stock shares issued | 3,549,381 |  |  |  |
Issuance of common stock public offering | $ 847,400 | $ 17,632 | $ 31,053 | $ 95,585 | $ 125,071
Underwriting discounts and offering costs | $ 15,100 |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |
Overview Of Company [Line Items] |  |  |  |  |
Common stock shares issued | 102,880 |  |  |  |
Issuance of common stock public offering | $ 25,000 |  |  |  |

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