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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 30, 2019
CAD ($)
Jun. 30, 2021
USD ($)
Lease
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
Lease
Device
Segment
shares
Jun. 30, 2020
USD ($)
Device
shares
Dec. 31, 2020
USD ($)
Schedule Of Significant Accounting Policies [Line Items]            
Accounts receivable   $ 51,000   $ 51,000   $ 74,000
Allowance for doubtful accounts   400,000   400,000   400,000
Refunds from research and development tax credits   1,000   1,000   1,000
Rent deposits receivable           18,000
Inventory markdowns to net realizable value   0 $ 0 0 $ 2,000  
Depreciation expense   28,000 29,000 56,000 67,000  
Amortization expense related to intangible assets   $ 49,000 89,000 $ 106,000 215,000  
Intangible asset impairment loss         181,000  
Leases, initial term   12 months   12 months    
Number of operating lease | Lease   1   1    
Revenue   $ 71,000 $ 133,000 $ 155,000 $ 339,000  
Number of operating segment | Segment       1    
Number of reportable segment | Segment       1    
Common stock equivalents excluded from the computation of diluted weighted average shares outstanding | shares   1,233,230 388,344 1,233,230 388,344  
ASU 2020-06            
Schedule Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]   true   true    
Change in accounting principle, accounting standards update, early adoption [true false]   true   true    
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2021   Jan. 01, 2021    
Change in accounting principle, accounting standards update, immaterial effect [true false]   true   true    
Outstanding Stock Options            
Schedule Of Significant Accounting Policies [Line Items]            
Incremental common stock equivalents | shares   0 0 0 0  
Warrants            
Schedule Of Significant Accounting Policies [Line Items]            
Incremental common stock equivalents | shares   0 0 0 0  
Restricted Stock Units            
Schedule Of Significant Accounting Policies [Line Items]            
Incremental common stock equivalents | shares   0 0 0 0  
Derivative Financial Instruments            
Schedule Of Significant Accounting Policies [Line Items]            
Warrants expiration date   Apr. 30, 2021   Apr. 30, 2021    
Fair value of derivative financial instruments           0
HealthTech Connex, Inc. | Clinical Research and Co-Promotion Agreement            
Schedule Of Significant Accounting Policies [Line Items]            
Acquisition date fair value $ 360          
Agreement term at acquisition 10 years          
License revenue agreement term       10 years    
HealthTech Connex, Inc. | Strategic Alliance Agreement | Heuro Canada Incorporation            
Schedule Of Significant Accounting Policies [Line Items]            
Contract assets   $ 0   $ 0   0
Contract liabilities   0   0   0
Fee Revenue            
Schedule Of Significant Accounting Policies [Line Items]            
Revenue   0 $ 0 0 $ 9,000  
License Revenue            
Schedule Of Significant Accounting Policies [Line Items]            
Revenue   8,000 7,000 15,000 13,000  
License Revenue | HealthTech Connex, Inc. | Clinical Research and Co-Promotion Agreement            
Schedule Of Significant Accounting Policies [Line Items]            
Revenue   8,000 7,000 15,000 13,000  
Deferred revenue   200,000   200,000    
Customer Relationships            
Schedule Of Significant Accounting Policies [Line Items]            
Fully amortized finite-lived intangible assets written-off       200,000    
Customer Relationships | Level 3            
Schedule Of Significant Accounting Policies [Line Items]            
Intangible asset impairment loss       200,000    
Heuro Canada Incorporation            
Schedule Of Significant Accounting Policies [Line Items]            
Goodwill impairment loss recognized       0    
Heuro Canada Incorporation | Selling, General and Administrative Expenses            
Schedule Of Significant Accounting Policies [Line Items]            
Amortization expense related to intangible assets   49,000 100,000 $ 100,000 200,000  
Heuro Canada Incorporation | Selling, General and Administrative Expenses | Customer Relationships            
Schedule Of Significant Accounting Policies [Line Items]            
Intangible asset impairment loss         200,000  
Minimum            
Schedule Of Significant Accounting Policies [Line Items]            
Effective income tax rate       50.00%    
Leasehold Improvements            
Schedule Of Significant Accounting Policies [Line Items]            
Estimated useful life       5 years    
Furniture and Fixtures            
Schedule Of Significant Accounting Policies [Line Items]            
Estimated useful life       7 years    
Equipment            
Schedule Of Significant Accounting Policies [Line Items]            
Estimated useful life       15 years    
Computer Software and Hardware | Minimum            
Schedule Of Significant Accounting Policies [Line Items]            
Estimated useful life       3 years    
Computer Software and Hardware | Maximum            
Schedule Of Significant Accounting Policies [Line Items]            
Estimated useful life       5 years    
PoNS            
Schedule Of Significant Accounting Policies [Line Items]            
Number of devices recorded as deferred revenue | Device       34    
Deferred revenue   300,000   $ 300,000    
PoNS | Heuro Canada Incorporation            
Schedule Of Significant Accounting Policies [Line Items]            
Revenue         $ 100,000  
Number of devices resulting in recognition of revenue | Device       0 11  
Number of devices | Device         55  
Quebec            
Schedule Of Significant Accounting Policies [Line Items]            
Other receivables refunds related to goods, services and sales tax   200,000   $ 200,000   100,000
Revenue from Product Sales            
Schedule Of Significant Accounting Policies [Line Items]            
Accounts receivable   51,000   51,000   $ 100,000
Revenue   $ 63,000 $ 100,000 $ 100,000 $ 300,000