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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 05, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol HSDT    
Title of 12(b) Security Class A Common Stock, $0.001 par value per share    
Security Exchange Name NASDAQ    
Entity Registrant Name HELIUS MEDICAL TECHNOLOGIES, INC.    
Entity Central Index Key 0001610853    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-38445    
Entity Tax Identification Number 36-4787690    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 642 Newtown Yardley Road, Suite 100    
Entity Address, City or Town Newtown    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 18940    
City Area Code (215)    
Local Phone Number 944-6100    
Entity Common Stock, Shares Outstanding   2,311,099  
Entity Public Float     $ 17,405,309
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement to be filed with the Commission pursuant to Regulation 14A in connection with the registrant’s 2021 Annual Meeting of Stockholders, to be filed subsequent to the date hereof, are incorporated by reference into Part III of this report.  Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission not later than 120 days after the conclusion of the registrant’s fiscal year ended December 31, 2020.