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Stockholders' equity - Summary of Stockholders' Equity (Detail) - shares | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class Of Stock Disclosures [Abstract] |  |  |
Common stock, shares issued, beginning balance | 12,313,757 | 12,307,157 | 12,380,657
Common stock, shares outstanding, beginning balance | 12,313,757 | 12,307,157 | 12,380,657
Issued | 4,800 | 6,600 | 5,400
Acquired | 0 | 0 | (78,900)
Acquired, Outstanding |  |  | (78,900)
Retired, Issued |  |  | (78,900)
Retired |  |  | 78,900
Common stock, shares issued, ending balance | 12,318,557 | 12,313,757 | 12,307,157
Common stock, shares outstanding, ending balance | 12,318,557 | 12,313,757 | 12,307,157

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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