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Nature of the Business and Basis of Presentation - Additional information (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 16, 2020 | Jan. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Date of incorporation |  |  |  |  | Oct. 21, 2016 |  |
Net proceeds from shares issued |  | $ 211,300 |  |  |  |  |
Net loss |  |  | $ (30,791) | $ (17,731) | $ (56,353) | $ (35,448) |
Used in BS |  |  | $ (245,328) |  | $ (245,328) |  | $ (188,975)
Common Stock [Member] |  |  |  |  |  |  |
Shares issued during the period |  | 9,200,000 | 15,511 | 12,105,263 | 9,200,000 | 12,105,263 |
Common Stock [Member] | IPO [Member] |  |  |  |  |  |  |
Shares issued during the period | 12,105,263 |  |  |  |  |  |
Net proceeds from shares issued | $ 210,700 |  |  |  |  |  |
Common Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |
Shares issued during the period | 1,578,947 | 1,200,000 |  |  |  |  |

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