Unaudited Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net gain (loss) on intra-entity foreign currency transactions	$ 0.1	$ (0.8)	$ 0.2	$ (1.2)

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