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Stockholders' Equity - Additional Information - Deferred Stock Units (Detail) - Deferred Stock Units [Member] - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 01, 2019
Schedule Of Stockholders Equity [Line Items]
Number of stock unit received			1
Deferred stock units	2,845
Compensation expense related to grants	$ 79,768
DSUs outstanding	89,409	73,231
Director [Member]
Schedule Of Stockholders Equity [Line Items]
Compensation expense related to grants	$ 8,661
Executive Employees [Member]
Schedule Of Stockholders Equity [Line Items]
Deferred stock units	13,333

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