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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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