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Net Income (Loss) Per Share - Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic net income (loss) per common share calculation:        
Net income (loss) attributable to Sonida shareholders $ (26,911) $ (13,758) $ (41,003) $ 3,445
Less: Dividends on Series A Preferred Stock (1,410) (1,409) (4,228) (1,409)
Less: Undeclared dividends on Series A Preferred Stock 0 0 0 (2,707)
Net loss attributable to common shareholders $ (28,321) $ (15,167) $ (45,231) $ (671)
Weighted average shares outstanding — basic (in shares) 18,103 15,456 18,081 12,787
Basic net loss per share (in USD per share) $ (1.56) $ (0.98) $ (2.50) $ (0.05)
Diluted net income (loss) per common share calculation:        
Net loss attributable to common shareholders $ (28,321) $ (15,167) $ (45,231) $ (671)
Weighted average shares outstanding — diluted (in shares) 18,103 15,456 18,081 12,787
Diluted net loss per share (in USD per share) $ (1.56) $ (0.98) $ (2.50) $ (0.05)