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Stockholders' equity - Summary of Stockholders' Equity (Detail) - shares
 12 Months Ended
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