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Net Loss per Share - Schedule of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:                
Net loss $ (44,041) $ (50,579) $ (73,449) $ (137,104) $ (93,515) $ (398,509) $ (168,069) $ (629,128)
Net loss attributable to non-controlling interest (577)     (690)     (2,580) (2,551)
Net loss attributable to American Well Corporation $ (43,464)     $ (136,414)     $ (165,489) $ (626,577)
Denominator:                
Weighted-average common shares outstanding, basic 15,135,421     14,294,690     14,864,967 14,149,576
Weighted-average common shares outstanding, diluted 15,135,421     14,294,690     14,864,967 14,149,576
Net loss per share attributable to common stockholders, basic $ (2.87)     $ (9.54)     $ (11.13) $ (44.28)
Net loss per share attributable to common stockholders, diluted $ (2.87)     $ (9.54)     $ (11.13) $ (44.28)