Description of Business	3 Months Ended
Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS Helius Medical Technologies, Inc. (the “Company”), is a neurotechnology company focused on neurological wellness. The Company’s purpose is to develop, license or acquire non-invasive technologies targeted at reducing symptoms of neurological disease or trauma. The Company’s first product, known as the Portable Neuromodulation Stimulator (“PoNS™”), is an authorized medical device in Canada for the treatment of chronic balance deficit associated with a mild to moderate traumatic brain injury (“mmTBI”), and is an investigational, non-invasive, medical device for which the Company has submitted an application for a CE mark for marketing authorization in the European Union, to improve balance in patients following a mmTBI. The Company’s PoNS device, when combined with targeted physical and/or cognitive therapy, (“PoNS Treatment”), is the first and only treatment that combines neurostimulation of cranial nerves via the tongue to restore lost function. In April 2019, the Company announced that the U.S. Food and Drug administration (“FDA”) had completed its review and declined the Company’s request for de novo classification and marketing authorization of the PoNS device in the United States. On December 21, 2018, the Company’s wholly owned subsidiary NeuroHabilitation Corporation changed its name to Helius Medical, Inc (“HMI”). On January 31, 2019, the Company formed another wholly owned subsidiary, Helius NeuroRehab, Inc., (“HNR”), a Delaware corporation, which will operate a clinical research site as well as a rehabilitation clinic that will provide the PoNS Treatment to patients with balance and gait disorder upon receipt of marketing authorization from the FDA. The Company’s wholly owned subsidiaries are comprised of HMI, Helius Medical Technologies (Canada), Inc., (“HMC”), and HNR. The Company was incorporated in British Columbia, Canada, on March 13, 2014. On May 28, 2014, the Company completed a continuation via a plan of arrangement whereby the Company moved from being a corporation governed by the British Columbia Corporations Act to a corporation governed by the Wyoming Business Corporations Act. On July 20, 2018, the Company completed its reincorporation from Wyoming to the state of Delaware. The Company is headquartered in Newtown, Pennsylvania. The Company’s Class A common stock, par value $0.001 per share (“common stock”) is listed on the Nasdaq Capital Market (“Nasdaq”) and the Toronto Stock Exchange (the “TSX”). The common stock began trading on the Canadian Securities Exchange on June 23, 2014, under the ticker symbol “HSM” and the trading was subsequently transferred to the TSX on April 18, 2016. On April 11, 2018, the common stock began trading on Nasdaq under the ticker symbol “HSDT” after having traded on the OTCQB in the United States under the ticker symbol “HSDT” since February 10, 2015. Effective after the close of business on January 22, 2018, the Company completed a 1-for-5 reverse stock split of its common stock. All share and per share amounts in this quarterly report on Form 10-Q have been reflected on a post-split basis. Going Concern Uncertainty As of March 31, 2019, the Company had cash of $18.7 million. For the three months ended March 31, 2019, the Company had an operating loss of $6.8 million and as of March 31, 2019, its accumulated deficit was $93.7 million. The Company expects to continue to incur operating losses and net cash outflows until such time as it generates a level of revenue to support its cost structure. There is no assurance that the Company will achieve profitable operations, and, if achieved, whether it will be sustained on a continued basis. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The Company’s condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and satisfaction of liabilities in the ordinary course of business. The Company intends to fund ongoing activities by utilizing its current cash on hand, cash received from the sale of its PoNS device in Canada and by raising additional capital through equity or debt financings. There can be no assurance that the Company will be successful in raising that additional capital or that such capital, if available, will be on terms that are acceptable to the Company. If the Company is unable to raise sufficient additional capital, the Company may be compelled to reduce the scope of its operations and planned capital expenditures.

Description of Business

3 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. DESCRIPTION OF BUSINESS

Helius Medical Technologies, Inc. (the “Company”), is a neurotechnology company focused on neurological wellness. The Company’s purpose is to develop, license or acquire non-invasive technologies targeted at reducing symptoms of neurological disease or trauma.

The Company’s first product, known as the Portable Neuromodulation Stimulator (“PoNS™”), is an authorized medical device in Canada for the treatment of chronic balance deficit associated with a mild to moderate traumatic brain injury (“mmTBI”), and is an investigational, non-invasive, medical device for which the Company has submitted an application for a CE mark for marketing authorization in the European Union, to improve balance in patients following a mmTBI. The Company’s PoNS device, when combined with targeted physical and/or cognitive therapy, (“PoNS Treatment”), is the first and only treatment that combines neurostimulation of cranial nerves via the tongue to restore lost function. In April 2019, the Company announced that the U.S. Food and Drug administration (“FDA”) had completed its review and declined the Company’s request for de novo classification and marketing authorization of the PoNS device in the United States.

On December 21, 2018, the Company’s wholly owned subsidiary NeuroHabilitation Corporation changed its name to Helius Medical, Inc (“HMI”). On January 31, 2019, the Company formed another wholly owned subsidiary, Helius NeuroRehab, Inc., (“HNR”), a Delaware corporation, which will operate a clinical research site as well as a rehabilitation clinic that will provide the PoNS Treatment to patients with balance and gait disorder upon receipt of marketing authorization from the FDA. The Company’s wholly owned subsidiaries are comprised of HMI, Helius Medical Technologies (Canada), Inc., (“HMC”), and HNR.

The Company was incorporated in British Columbia, Canada, on March 13, 2014. On May 28, 2014, the Company completed a continuation via a plan of arrangement whereby the Company moved from being a corporation governed by the British Columbia Corporations Act to a corporation governed by the Wyoming Business Corporations Act. On July 20, 2018, the Company completed its reincorporation from Wyoming to the state of Delaware. The Company is headquartered in Newtown, Pennsylvania.

The Company’s Class A common stock, par value $0.001 per share (“common stock”) is listed on the Nasdaq Capital Market (“Nasdaq”) and the Toronto Stock Exchange (the “TSX”). The common stock began trading on the Canadian Securities Exchange on June 23, 2014, under the ticker symbol “HSM” and the trading was subsequently transferred to the TSX on April 18, 2016. On April 11, 2018, the common stock began trading on Nasdaq under the ticker symbol “HSDT” after having traded on the OTCQB in the United States under the ticker symbol “HSDT” since February 10, 2015.

Effective after the close of business on January 22, 2018, the Company completed a 1-for-5 reverse stock split of its common stock. All share and per share amounts in this quarterly report on Form 10-Q have been reflected on a post-split basis.

Going Concern Uncertainty

As of March 31, 2019, the Company had cash of $18.7 million. For the three months ended March 31, 2019, the Company had an operating loss of $6.8 million and as of March 31, 2019, its accumulated deficit was $93.7 million. The Company expects to continue to incur operating losses and net cash outflows until such time as it generates a level of revenue to support its cost structure. There is no assurance that the Company will achieve profitable operations, and, if achieved, whether it will be sustained on a continued basis. These factors raise substantial doubt about the Company’s ability to continue as a going concern. The Company’s condensed consolidated financial statements have been prepared on the basis of continuity of operations, realization of assets and satisfaction of liabilities in the ordinary course of business.

The Company intends to fund ongoing activities by utilizing its current cash on hand, cash received from the sale of its PoNS device in Canada and by raising additional capital through equity or debt financings. There can be no assurance that the Company will be successful in raising that additional capital or that such capital, if available, will be on terms that are acceptable to the Company. If the Company is unable to raise sufficient additional capital, the Company may be compelled to reduce the scope of its operations and planned capital expenditures.