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Commitments and Contingencies - Additional Information (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jun. 01, 2020 | Apr. 13, 2020 | Dec. 29, 2017 | Jan. 22, 2013 | May 31, 2020 | Jul. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 30, 2017
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease commencement date |  |  |  |  |  | Jul. 01, 2020 | Jul. 17, 2017 | Jul. 01, 2017 |  |  |
Lease termination date |  |  |  |  |  | Jun. 30, 2021 | Jan. 16, 2023 | Dec. 31, 2022 |  |  |
Lease option to extend termination year |  |  |  |  |  |  |  | 2027 |  |  |
Lease option to extend termination date |  |  |  |  |  |  | Jan. 31, 2028 |  |  |  |
Lease monthly rent plus utilities |  |  |  |  |  | $ 5,000 | $ 20,000 |  |  |  |
Lease monthly rent plus utilities beginning date |  |  |  |  |  | Jan. 31, 2021 | Jan. 31, 2018 |  |  |  |
Lease annual increase in rental percentage |  |  |  |  |  | 3.00% | 3.00% |  |  |  |
Lease option to extend lease term |  |  |  |  |  | 6 months |  |  |  |  |
Decrease in operating lease right of use asset, partial termination |  |  |  |  |  | $ 400,000 |  |  |  |  |
Decrease in operating lease liability |  |  |  |  |  | $ 400,000 |  |  |  |  |
PPP Loan |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan proceeds received, amount |  |  | $ 323,000 |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on termination of lease |  |  |  |  |  |  |  |  | $ 100,000 |  |
Advanced NeuroRehabilitation, LLC | License Agreement for Exclusive Right on Patent Pending Technology |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for license agreement |  |  |  |  | 91,628 |  |  |  |  |  |
Percentage of royalty on net revenue |  |  |  |  | 4.00% |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  | $ 22,000 | $ 59,000 |
A&B Company Limited | Asset Purchase Agreement |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract penalty payable on failure to obtain FDA clearance |  |  |  |  |  |  |  |  |  |  | $ 2,000,000
Key Tronic Corporation | Manufacturing and Supply Agreement |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Agreement description |  |  |  |  |  |  |  |  | On December 29, 2017, HMI (formerly known as NeuroHabilitation Corporation) entered into a Manufacturing and Supply Agreement (“MSA”) with Key Tronic Corporation (“Key Tronic”), for the manufacture and supply of the Company’s PoNS device based upon the Company’s product specifications as set forth in the MSA. Per the agreement, the Company shall provide to Key Tronic a rolling forecast for the procurement of parts and material and within normal lead times based on estimated delivery dates for the manufacture of the PoNS device. The term of the agreement is for three years and the agreement will automatically renew for additional consecutive terms of one year, unless cancelled by either party upon 180-day written notice to the other party prior to the end of the then current term. On June 1, 2020, HMI extended the existing manufacturing agreement with Key Tronic for a second three year term from December 29, 2020 until December 31, 2023. As of December 31, 2020, the Company did not have any outstanding commitments to Key Tronic to complete the Company’s forecast for the procurement of materials necessary for the delivery of PoNS devices. |  |
Agreement term |  |  |  | 3 years |  |  |  |  |  |  |
Agreement auto renewal period |  |  |  | 1 year |  |  |  |  |  |  |
Notice period to cancel the renewal of agreement |  |  |  | 180 days |  |  |  |  |  |  |
Long-term purchase commitment amount | $ 0 |  |  |  |  |  |  |  |  |  |
Extended manufacturing agreement term |  | 3 years |  |  |  |  |  |  |  |  |

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