Description of Business	3 Months Ended
Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS Helius Medical Technologies, Inc. (the “Company”) is engaged primarily in the medical technology industry focused on neurological wellness. The Company’s planned principal operations include the development, licensing and acquisition of unique and non-invasive platform technologies to amplify the brain’s ability to heal itself. Many patients with brain injury or brain-related disease have disrupted neural networks that result in their brains being unable to correctly or efficiently carry neural impulses, which are responsible for directing bodily functions like movement control or sensory perception. Our first product in development, known as the portable neuromodulation stimulator or PoNS^® device, is designed to enhance the brain’s ability to compensate for this damage. Our PoNS Treatment is the combination of our PoNS device and functional, targeted physical or cognitive therapy, and is currently being developed for the treatment of movement, gait and balance disorders in patients with traumatic brain injury, or TBI, and other chronic neurological diseases. 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. The Company is based in Newtown, Pennsylvania. The Company has two wholly-owned subsidiaries, Neurohabilitation Corporation (“NHC”) and Helius Medical Technologies (Canada), Inc. (“Helius Canada”). The Company’s Class A common stock (“common stock”) is listed on the Nasdaq Capital Market (“Nasdaq”) and the Toronto Stock Exchange (the “TSX”). The Company’s Class A common stock began trading on the Canadian Securities Exchange on June 23, 2014, under the ticker symbol “HSM”, and subsequently moved to the TSX on April 18, 2016. On April 11, 2018, the Company’s Class A common stock began trading on the Nasdaq under the ticker symbol “HSDT” after having been traded on the OTCQB under the ticker symbol “HSDT” since February 10, 2015. The Company’s financial information is presented in United States Dollars. Reverse Stock Split Effective after the close of business on January 22, 2018, the Company completed a 1-for-5 reverse stock split of its Class A Common Stock. All share and per share amounts in this Quarterly Report have been reflected on a post-split basis. Liquidity and Financial Condition The Company has not generated any product revenues and has not achieved profitable operations. 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. As of March 31, 2018, the Company had cash of $4.4 million. In April 2018, the Company issued 2,463,185 shares of its common stock and warrants to purchase 2,463,185 shares of the Company’s common stock in an underwritten public offering at a price of $7.47 per share and accompanying warrants. Net proceeds from the offering after deducting underwriting discounts and commissions was approximately $17.3 million. The Company estimates that offering expenses will be approximately $1.0 million (see Note 9). While the actual amount of cash that the Company will need to operate is subject to many factors, the Company believes that its current cash position along with the net proceeds received from the offering will be sufficient to fund its operations through the second quarter of 2019. The Company intends to fund ongoing activities by utilizing its current cash 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.

1. DESCRIPTION OF BUSINESS

Helius Medical Technologies, Inc. (the “Company”) is engaged primarily in the medical technology industry focused on neurological wellness. The Company’s planned principal operations include the development, licensing and acquisition of unique and non-invasive platform technologies to amplify the brain’s ability to heal itself.

Many patients with brain injury or brain-related disease have disrupted neural networks that result in their brains being unable to correctly or efficiently carry neural impulses, which are responsible for directing bodily functions like movement control or sensory perception. Our first product in development, known as the portable neuromodulation stimulator or PoNS^® device, is designed to enhance the brain’s ability to compensate for this damage. Our PoNS Treatment is the combination of our PoNS device and functional, targeted physical or cognitive therapy, and is currently being developed for the treatment of movement, gait and balance disorders in patients with traumatic brain injury, or TBI, and other chronic neurological diseases.

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. The Company is based in Newtown, Pennsylvania.

The Company has two wholly-owned subsidiaries, Neurohabilitation Corporation (“NHC”) and Helius Medical Technologies (Canada), Inc. (“Helius Canada”).

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

Reverse Stock Split

Effective after the close of business on January 22, 2018, the Company completed a 1-for-5 reverse stock split of its Class A Common Stock. All share and per share amounts in this Quarterly Report have been reflected on a post-split basis.

Liquidity and Financial Condition

The Company has not generated any product revenues and has not achieved profitable operations. 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.

As of March 31, 2018, the Company had cash of $4.4 million. In April 2018, the Company issued 2,463,185 shares of its common stock and warrants to purchase 2,463,185 shares of the Company’s common stock in an underwritten public offering at a price of $7.47 per share and accompanying warrants. Net proceeds from the offering after deducting underwriting discounts and commissions was approximately $17.3 million. The Company estimates that offering expenses will be approximately $1.0 million (see Note 9). While the actual amount of cash that the Company will need to operate is subject to many factors, the Company believes that its current cash position along with the net proceeds received from the offering will be sufficient to fund its operations through the second quarter of 2019.

The Company intends to fund ongoing activities by utilizing its current cash 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.