CONVERTIBLE SENIOR NOTES - Minimum interest payments (Details) - Convertible Senior Notes $ in Thousands	Mar. 31, 2024 USD ($)
Minimum interest payments
2024	$ 3,000
2025	3,000
2026	$ 1,500

Amount of interest on long-term debt payable issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year.

No definition available.

Name:	zyxi_LongTermDebtMaturitiesRepaymentsOfInterestYearTwo
Namespace Prefix:	zyxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant