Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net gain (loss) on intra-entity foreign currency transactions	$ (0.4)	$ (0.9)	$ (0.2)	$ (2.0)

Other comprehensive income net gain loss on intra entity foreign currency transactions arising during period net of tax.

No definition available.

Name:	dzsi_OtherComprehensiveIncomeNetGainLossOnIntraEntityForeignCurrencyTransactionsArisingDuringPeriodNetOfTax
Namespace Prefix:	dzsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration