Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 25, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Registrant Name	INTERNATIONAL TOWER HILL MINES LTD
Entity Central Index Key	0001134115
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Trading Symbol	THM
Entity Common Stock, Shares Outstanding		186,990,683
Entity Emerging Growth Company	false
Entity Small Business	true