Loss Per Common Share - Summary of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loss Per Common Share
Net loss attributable to IDEX common stockholders	$ (98,400)	$ (98,508)
Basic
Basic weighted average common shares outstanding	213,490,535	119,766,859
Diluted
Diluted weighted average common shares outstanding	213,490,535	119,766,859
Net loss per share:
Basic	$ 0.46	$ 0.82
Diluted	$ 0.46	$ 0.82