Name:	us-gaap_AssetsAndAssociatedLiabilitiesOfTransfersAccountedForAsSecuredBorrowingsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)
-SubTopic 30
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Name:	us-gaap_TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Name:	us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The percentage advance rate on billed charges for eligible receivables under the funding agreement.

No definition available.

Name:	zyxi_AdvancesOnBilledChargesForEligibleReceivablesPercentage
Namespace Prefix:	zyxi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

The percentage advance rate on billed charges for future receivables under the funding agreement.

No definition available.

Name:	zyxi_AdvancesOnBilledChargesForFutureReceivablesPercentage
Namespace Prefix:	zyxi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The retention percentage of collections retained by the funding counterparty.

No definition available.