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BASIS OF PRESENTATION - Additional information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 01, 2019
Jan. 01, 2018
Mar. 31, 2016
Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 27.00%     35.00%        
Inventory, Net $ 2,129,000   $ 837,000          
Liability for Claims and Claims Adjustment Expense $ 0   880,000       $ 880,000 $ 0
Lease, Practical Expedients, Package [true false] true              
Lease, Practical Expedient, Use of Hindsight [true false] true              
Operating Lease, Right-of-Use Asset $ 4,078,000   3,050,000   $ 1,600,000      
Operating Lease, Liability 4,704,000       $ 1,600,000      
Cumulative Effect of New Accounting Principle in Period of Adoption       $ (6,000)        
Retained Earnings (Accumulated Deficit) $ 11,409,000   4,864,000     $ 6,000,000    
Effect of the Adoption of ASC 842 [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Inventory, Net     0          
Liability for Claims and Claims Adjustment Expense     0          
Operating Lease, Right-of-Use Asset     3,050,000 [1]     3,600,000    
Operating Lease, Liability           $ 3,900,000    
Retained Earnings (Accumulated Deficit) [2]     $ (7,000)          
Zynex Billing And Consultancy, LLC [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Non-controlling interest (as a percentage) 20.00%              
Scenario, Plan [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%          
North America [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Percentage Of Revenues 99.99% 99.99%            
[1] Represents capitalization of operating lease assets, recognition of operating lease liabilities and reclassification of tenant incentives and deferred rent balances
[2] Represents the impact of changes in financing lease terms for certain leases due to the application of the hindsight practical expedient