Earnings (Loss) Per Common Share - Summary of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to Ideanomics, Inc. common shareholders	$ (50,851)	$ (8,286)	$ (64,526)	$ (47,212)
Basic weighted average common shares outstanding (in shares)	473,829,962	237,535,999	432,989,602	191,976,856
Effect of dilutive securities
Convertible preferred shares- Series A (in shares)	0	0	0	0
Convertible promissory notes (in shares)	0	0	0	0
Diluted potential common shares (in shares)	473,829,962	237,535,999	432,989,602	191,976,856
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.11)	$ (0.03)	$ (0.15)	$ (0.25)
Diluted (in dollars per share)	$ (0.11)	$ (0.03)	$ (0.15)	$ (0.25)