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Stock Compensation - Summary of Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity (Detail) - Restricted Stock [Member]
9 Months Ended
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested as of December 31, 2020 41,363
Vested (37,226)
Unvested as of September 30, 2021 4,137