Cover - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Jun. 28, 2019
Cover [Abstract]
Entity Registrant Name	ETHEMA HEALTH Corp
Entity Central Index Key	0000792935
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	CO
Entity File Number	000-15078
Entity Public Float			$ 4,898,198
Entity Common Stock, Shares Outstanding		1,841,090,247
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019