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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, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:                
Net loss $ (70,575) $ (69,652) $ (70,253) $ (50,932) $ (38,136) $ (39,805) $ (210,480) $ (128,873)
Net loss attributable to non-controlling interest (491)     562     (1,214) (332)
Net loss attributable to American Well Corporation $ (70,084)     $ (51,494)     $ (209,266) $ (128,541)
Denominator:                
Weighted-average common shares outstanding, basic 277,389,730     257,283,961     272,846,985 250,115,414
Weighted-average common shares outstanding, diluted 277,389,730     257,283,961     272,846,985 250,115,414
Net loss per share attributable to common stockholders, basic $ (0.25)     $ (0.20)     $ (0.77) $ (0.51)
Net loss per share attributable to common stockholders, diluted $ (0.25)     $ (0.20)     $ (0.77) $ (0.51)