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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