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Net Loss per Share - Schedule of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net loss $ (212,638) $ (679,171) $ (272,072)
Net loss attributable to non-controlling interest (4,495) (4,007) (1,643)
Net loss attributable to American Well Corporation $ (208,143) $ (675,164) $ (270,429)
Denominator:      
Weighted-average common shares outstanding, basic 14,999,590 14,212,505 13,712,290
Weighted-average common shares outstanding, diluted 14,999,590 14,212,505 13,712,290
Net loss per share attributable to common stockholders, basic $ (13.88) $ (47.5) $ (19.72)
Net loss per share attributable to common stockholders, diluted $ (13.88) $ (47.5) $ (19.72)