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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

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