Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 2)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed rental payments for each month.

+ References

No definition available.

+ Details

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Namespace Prefix:	zyxi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Imputed interest rate on capital lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	zyxi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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CAPITAL LEASES AND OTHER OBLIGATIONS (Details Textual) - USD ($) $ in Thousands	1 Months Ended		9 Months Ended
	Dec. 31, 2016	Jul. 31, 2016	Sep. 30, 2017
Debt Instrument [Line Items]
Lease termination date			Dec. 31, 2018
Lease Termination Agreement And New Lease Agreement
Debt Instrument [Line Items]
Fixed rental payments for each month	$ 38,000	$ 49,000
Maximum
Debt Instrument [Line Items]
Imputed interest rate on lease			10.00%
Minimum
Debt Instrument [Line Items]
Imputed interest rate on lease			2.00%
Assembly Equipment
Debt Instrument [Line Items]
Cost of assets under capital lease			$ 461,000
Accumulated depreciation			$ 356,000