SIGNIFICANT ACCOUNTING POLICIES - Non-controlling Interest (Details)	12 Months Ended
Dec. 31, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loss on dissolution	$ (77,000)
Zynex Billing And Consultancy, LLC [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-controlling interest (as a percentage)	20.00%
Loss on dissolution	$ 77,000

Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

Name:	us-gaap_DeconsolidationGainOrLossAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration