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COMMITMENTS AND CONTINGENCIES (Details Textual)	1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 30, 2018 a	Oct. 20, 2017 USD ($) a	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Leases, Rent Expense			$ 4,500	$ 900,000	$ 500,000
Lessee Operating Sublease Rent Description		first year of the sublease, the rent per square foot is $7.50, increasing to $19.75 during the second year of the sublease and each year thereafter for the initial term increasing by an additional $1 per square foot.
Land Subject to Ground Leases | a	12,494	41,715
Rate Per Square Feet | a	26.50
Tenant Improvements		$ 200,000
Deferred Rent Credit				$ 600,000

X

- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Area of land subject to a ground lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

A description of Changes in lease rent payments for the different periods of lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	zyxi_
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X

- Definition

Amount of rental rate per square feet of the leased asset.

+ References

No definition available.

+ Details

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