STOCKHOLDERS' DEFICIT (Parenthetical) (Details 5)	Dec. 31, 2019 $ / shares
Stockholders Equity Note [Abstract]
Warrants exercise price per share for the one-year period following the merger	$ 12

Class of warrant or right exercise price of warrants or rights permitted.

No definition available.

Name:	emma_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsPermitted
Namespace Prefix:	emma_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant