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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