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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Net loss $ (272,072) $ (176,782) $ (228,626)
Net loss attributable to non-controlling interest (1,643) (448) (4,194)
Net loss attributable to American Well Corporation $ (270,429) $ (176,334) $ (224,432)
Denominator:      
Weighted-average common shares outstanding, basic 274,249,749 254,068,942 99,044,312
Weighted-average common shares outstanding, diluted 274,249,749 254,068,942 99,044,312
Net loss per share attributable to common stockholders, basic $ (0.99) $ (0.69) $ (2.27)
Net loss per share attributable to common stockholders, diluted $ (0.99) $ (0.69) $ (2.27)