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Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2015
Jan. 08, 2016
Sep. 30, 2014
Document Type 10-K    
Amendment Flag true    
Amendment Description Helius Medical Technologies, Inc. (the “Company”) is filing this amendment on Form 10-K/A (this “Amendment”) to amend its Annual Report on Form 10-K for the fiscal year ended March 31, 2015, as filed on June 29, 2015 (the “Original Filing”), to restate (1) its consolidated financial statements as of and for the fiscal year ended March 31, 2015 and (2) selected financial data as of and for the fiscal year ended March 31, 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 12 “Restatement of Previously Issued Financial Statements” to the Company’s restated 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 March 31, 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 March 31, 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, and the consents of each of its independent registered public accounting firms are attached to this Amendment as Exhibits 31.1, 31.2, 32.1, 23.1 and 23.2, respectively.    
Document Period End Date Mar. 31, 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    
Entity Public Float     $ 59,502,069
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY