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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Mar. 21, 2022
Dec. 31, 2022
Mar. 13, 2023
Jun. 30, 2022
Document and Entity Information        
Document Type   10-K    
Document Annual Report   true    
Document Period End Date   Dec. 31, 2022    
Document Transition Report   false    
Entity File Number   001-38804    
Entity Registrant Name   ZYNEX, INC.    
Entity Incorporation, State or Country Code   NV    
Entity Tax Identification Number   90-0275169    
Entity Address, Address Line One   9655 Maroon Circle    
Entity Address, City or Town   Englewood    
Entity Address, State or Province   CO    
Entity Address, Postal Zip Code   80112    
City Area Code   303    
Local Phone Number   703-4906    
Title of 12(b) Security   Common Stock, $0.001 par value per share    
Trading Symbol   ZYXI    
Security Exchange Name   NASDAQ    
Entity Well-known Seasoned Issuer   No    
Entity Voluntary Filers   No    
Entity Current Reporting Status   Yes    
Entity Interactive Data Current   Yes    
Entity Filer Category   Accelerated Filer    
Entity Small Business   true    
Entity Emerging Growth Company   false    
Entity Shell Company   false    
Entity Public Float       $ 175.2
Entity Common Stock, Shares Outstanding     36,634,459  
Current Fiscal Year End Date   --12-31    
Document Fiscal Year Focus   2022    
Document Fiscal Period Focus   FY    
Entity Central Index Key   0000846475    
Amendment Flag   false    
ICFR Auditor Attestation Flag   true    
Auditor Name Plante & Moran, PLLC Marcum LLP    
Auditor Firm ID 166 688    
Auditor Location Denver, Colorado New York, NY