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Document and Entity Information - shares
 6 Months Ended
Sep. 30, 2015
Jan. 08, 2016
Document Type 10-Q  
Amendment Flag true  
Amendment Description Helius Medical Technologies, Inc. (the “Company”) is filing this amendment on Form 10-Q/A (this “Amendment”) to amend its Quarterly Report on Form 10-Q for the three and six months ended September 30, 2015, as filed on November 16, 2015 (the “Original Filing”), to restate its interim condensed consolidated financial statements as of and for the three and six months ended September 30, 2015, as a result of the Company not previously re-measuring the fair value of stock options awarded to non-employees that had not yet vested. See Note 11 “Restatement of Previously Issued Financial Statements” to the Company’s restated interim condensed consolidated financial statements.In connection with the Original Filing, under the direction of our Chief Executive Officer and our Chief Financial Officer, our management evaluated our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act, and concluded that our disclosure controls and procedures were ineffective as of September 30, 2015. Subsequently, the Company’s management has determined that the improper design of controls with respect to the calculation of the fair value of the Company’s share based compensation was a deficiency in its internal control over financial reporting resulting from the material weakness identified at September 30, 2015.Except as required to reflect the effects of the corrections for the items above, no additional modifications or updates have been made to the Original Filing and are set forth in this Amendment. Information not affected by these corrections remains unchanged and reflects the disclosure made at the time of the Original Filing. This Amendment does not describe other events occurring after the Original Filing, including exhibits, or modify or update those disclosures affected by subsequent events. This Amendment should be read in conjunction with the Company’s filings made with the Securities and Exchange Commission subsequent to the filing of the Original Filing, as information in such reports and documents may update or supersede certain information contained in this Amendment.The certifications of the Company’s Chief Executive Officer and Chief Financial Officer are attached to this Amendment as Exhibits 31.1, 31.2, and 32.1 respectively.  
Document Period End Date Sep. 30, 2015  
Trading Symbol hsm  
Entity Registrant Name HELIUS MEDICAL TECHNOLOGIES, INC.  
Entity Central Index Key 0001610853  
Current Fiscal Year End Date --03-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   72,193,209
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well Known Seasoned Issuer No  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2