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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings per share [abstract]        
Profit applicable to DoubleDown Interactive Co., Ltd. $ 21,842 $ 33,083 $ 45,688 $ 63,407
Weighted average shares outstanding - basic (in shares) 2,477,672 2,477,672 2,477,672 2,477,672
Basic earnings per share (in dollars per share) $ 8.82 $ 13.35 $ 18.44 $ 25.59
Dilutive effect of all instruments on weighted average number of ordinary shares     0 0