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Stock Purchase - Additional Information (Detail) - USD ($) | 1 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Oct. 31, 2018
Stock Repurchase Program [Line Items] |  |
Shares authorized to purchase |  | 3,000,000
Cost of repurchased shares, including commissions | $ 3,134,727 |
Number of shares repurchased | 50,000 |

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