3.22.2 html 227 309 1 false 71 0 false 5 false false R1.htm 100000 - Document - Document and Entity Information Sheet http://dzsi.com/20220630/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 100010 - Statement - Unaudited Condensed Consolidated Balance Sheets Sheet http://dzsi.com/20220630/taxonomy/role/Role_StatementUnauditedCondensedConsolidatedBalanceSheets Unaudited Condensed Consolidated Balance Sheets Statements 2 false false R3.htm 100020 - Statement - Unaudited Condensed Consolidated Balance Sheets (Parenthetical) Sheet http://dzsi.com/20220630/taxonomy/role/Role_StatementUnauditedCondensedConsolidatedBalanceSheetsParenthetical Unaudited Condensed Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) Sheet http://dzsi.com/20220630/taxonomy/role/Role_StatementUnauditedCondensedConsolidatedStatementsOfComprehensiveIncomeLoss Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) Statements 4 false false R5.htm 100040 - Statement - Unaudited Condensed Consolidated Statements of Stockholders' Equity Sheet http://dzsi.com/20220630/taxonomy/role/Role_StatementUnauditedCondensedConsolidatedStatementsOfStockholdersEquity Unaudited Condensed Consolidated Statements of Stockholders' Equity Statements 5 false false R6.htm 100050 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows Sheet http://dzsi.com/20220630/taxonomy/role/Role_StatementUnauditedCondensedConsolidatedStatementsOfCashFlows Unaudited Condensed Consolidated Statements of Cash Flows Statements 6 false false R7.htm 100060 - Disclosure - Organization and Summary of Significant Accounting Policies Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPolicies Organization and Summary of Significant Accounting Policies Notes 7 false false R8.htm 100070 - Disclosure - Business Combinations Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBusinessCombinations Business Combinations Notes 8 false false R9.htm 100080 - Disclosure - Fair Value Measurement Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurement Fair Value Measurement Notes 9 false false R10.htm 100090 - Disclosure - Cash, Cash Equivalents and Restricted Cash Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCash1 Cash, Cash Equivalents and Restricted Cash Notes 10 false false R11.htm 100100 - Disclosure - Balance Sheet Details Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetDetails Balance Sheet Details Notes 11 false false R12.htm 100110 - Disclosure - Goodwill and Intangible Assets Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets Goodwill and Intangible Assets Notes 12 false false R13.htm 100120 - Disclosure - Debt Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureDebt Debt Notes 13 false false R14.htm 100130 - Disclosure - Employee Benefit Plans Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureEmployeeBenefitPlans Employee Benefit Plans Notes 14 false false R15.htm 100140 - Disclosure - Restructuring and Other Charges Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRestructuringAndOtherCharges Restructuring and Other Charges Notes 15 false false R16.htm 100150 - Disclosure - Related Party Transactions Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactions Related Party Transactions Notes 16 false false R17.htm 100160 - Disclosure - Net Income (Loss) Per Share Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShare Net Income (Loss) Per Share Notes 17 false false R18.htm 100170 - Disclosure - Leases Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureLeases Leases Notes 18 false false R19.htm 100180 - Disclosure - Commitments and Contingencies Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 19 false false R20.htm 100190 - Disclosure - Income Taxes Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 20 false false R21.htm 100200 - Disclosure - Enterprise-Wide Information Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureEnterpriseWideInformation Enterprise-Wide Information Notes 21 false false R22.htm 100210 - Disclosure - Organization and Summary of Significant Accounting Policies (Policies) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesPolicies Organization and Summary of Significant Accounting Policies (Policies) Policies http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPolicies 22 false false R23.htm 100220 - Disclosure - Organization and Summary of Significant Accounting Policies (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesTables Organization and Summary of Significant Accounting Policies (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPolicies 23 false false R24.htm 100230 - Disclosure - Business Combinations (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureBusinessCombinationsTables Business Combinations (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBusinessCombinations 24 false false R25.htm 100240 - Disclosure - Fair Value Measurement (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureFairValueMeasurementTables Fair Value Measurement (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureFairValueMeasurement 25 false false R26.htm 100250 - Disclosure - Balance Sheet Details (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetDetailsTables Balance Sheet Details (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetDetails 26 false false R27.htm 100260 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets 27 false false R28.htm 100270 - Disclosure - Debt (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureDebtTables Debt (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureDebt 28 false false R29.htm 100280 - Disclosure - Related Party Transactions (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactions 29 false false R30.htm 100290 - Disclosure - Net Income (Loss) Per Share (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShareTables Net Income (Loss) Per Share (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShare 30 false false R31.htm 100300 - Disclosure - Leases (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureLeases 31 false false R32.htm 100310 - Disclosure - Enterprise-Wide Information (Tables) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureEnterpriseWideInformationTables Enterprise-Wide Information (Tables) Tables http://dzsi.com/20220630/taxonomy/role/Role_DisclosureEnterpriseWideInformation 32 false false R33.htm 100320 - Disclosure - Organization and Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Organization and Summary of Significant Accounting Policies - Additional Information (Details) Details 33 false false R34.htm 100330 - Disclosure - Organization and Summary of Significant Accounting Policies - Schedule of Revenues by Source (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesScheduleOfRevenuesBySourceDetails Organization and Summary of Significant Accounting Policies - Schedule of Revenues by Source (Details) Details 34 false false R35.htm 100340 - Disclosure - Organization and Summary of Significant Accounting Policies - Schedule of Information Revenues by Geographical Concentration (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesScheduleOfInformationRevenuesByGeographicalConcentrationDetails Organization and Summary of Significant Accounting Policies - Schedule of Information Revenues by Geographical Concentration (Details) Details 35 false false R36.htm 100350 - Disclosure - Organization and Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureOrganizationAndSummaryOfSignificantAccountingPoliciesScheduleOfAllowanceForDoubtfulAccountsDetails Organization and Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts (Details) Details 36 false false R37.htm 100360 - Disclosure - Business Combinations - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBusinessCombinationsAdditionalInformationDetails Business Combinations - Additional Information (Details) Details 37 false false R38.htm 100370 - Disclosure - Business Combinations - Summary of Provisional Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureBusinessCombinationsSummaryOfProvisionalEstimatedFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetails Business Combinations - Summary of Provisional Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) Details 38 false false R39.htm 100380 - Disclosure - Business Combinations - Schedule of Estimated Fair Value and Useful Lives of Identifiable Intangible Assets (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureBusinessCombinationsScheduleOfEstimatedFairValueAndUsefulLivesOfIdentifiableIntangibleAssetsDetails Business Combinations - Schedule of Estimated Fair Value and Useful Lives of Identifiable Intangible Assets (Details) Details 39 false false R40.htm 100390 - Disclosure - Fair Value Measurement - Schedule of Reconciliation of Level 3 Contingent Liability (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureFairValueMeasurementScheduleOfReconciliationOfLevel3ContingentLiabilityDetails Fair Value Measurement - Schedule of Reconciliation of Level 3 Contingent Liability (Details) Details 40 false false R41.htm 100400 - Disclosure - Cash, Cash Equivalents and Restricted Cash - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetails Cash, Cash Equivalents and Restricted Cash - Additional Information (Details) Details 41 false false R42.htm 100410 - Disclosure - Balance Sheet Details - Schedule of Inventories (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetDetailsScheduleOfInventoriesDetails Balance Sheet Details - Schedule of Inventories (Details) Details 42 false false R43.htm 100420 - Disclosure - Balance Sheet Details - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetDetailsAdditionalInformationDetails Balance Sheet Details - Additional Information (Details) Details 43 false false R44.htm 100430 - Disclosure - Balance Sheet Details - Schedule of Property, Plant and Equipment, Net (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetDetailsScheduleOfPropertyPlantAndEquipmentNetDetails Balance Sheet Details - Schedule of Property, Plant and Equipment, Net (Details) Details 44 false false R45.htm 100440 - Disclosure - Balance Sheet Details - Summary of Product Warranty Liability (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureBalanceSheetDetailsSummaryOfProductWarrantyLiabilityDetails Balance Sheet Details - Summary of Product Warranty Liability (Details) Details 45 false false R46.htm 100450 - Disclosure - Balance Sheet Details - Summary of Contract Assets and Contract Liabilities Related to Contracts with Customers (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureBalanceSheetDetailsSummaryOfContractAssetsAndContractLiabilitiesRelatedToContractsWithCustomersDetails Balance Sheet Details - Summary of Contract Assets and Contract Liabilities Related to Contracts with Customers (Details) Details 46 false false R47.htm 100460 - Disclosure - Goodwill and Intangible Assets - Schedule of Goodwill (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfGoodwillDetails Goodwill and Intangible Assets - Schedule of Goodwill (Details) Details 47 false false R48.htm 100470 - Disclosure - Goodwill and Intangible Assets - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetails Goodwill and Intangible Assets - Additional Information (Details) Details 48 false false R49.htm 100480 - Disclosure - Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsDetails Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) Details 49 false false R50.htm 100490 - Disclosure - Goodwill and Intangible Assets - Future Amortization Expense of Intangible Assets (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsFutureAmortizationExpenseOfIntangibleAssetsDetails Goodwill and Intangible Assets - Future Amortization Expense of Intangible Assets (Details) Details 50 false false R51.htm 100500 - Disclosure - Debt - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetails Debt - Additional Information (Details) Details 51 false false R52.htm 100510 - Disclosure - Debt - Schedule of Future Principal Maturities of Term Loan (Details) Sheet http://dzsi.com/20220630/taxonomy/role/DisclosureDebtScheduleOfFuturePrincipalMaturitiesOfTermLoanDetails Debt - Schedule of Future Principal Maturities of Term Loan (Details) Details 52 false false R53.htm 100520 - Disclosure - Employee Benefit Plans - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureEmployeeBenefitPlansAdditionalInformationDetails Employee Benefit Plans - Additional Information (Details) Details 53 false false R54.htm 100530 - Disclosure - Restructuring and Other Charges - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRestructuringAndOtherChargesAdditionalInformationDetails Restructuring and Other Charges - Additional Information (Details) Details 54 false false R55.htm 100540 - Disclosure - Related Party Transactions - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactionsAdditionalInformationDetails Related Party Transactions - Additional Information (Details) Details 55 false false R56.htm 100550 - Disclosure - Related Party Transactions - Indebtedness And Other Obligations Payment Guarantees (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactionsIndebtednessAndOtherObligationsPaymentGuaranteesDetails Related Party Transactions - Indebtedness And Other Obligations Payment Guarantees (Details) Details 56 false false R57.htm 100560 - Disclosure - Related Party Transactions - Sales and Purchases To and From Related Parties (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactionsSalesAndPurchasesToAndFromRelatedPartiesDetails Related Party Transactions - Sales and Purchases To and From Related Parties (Details) Details 57 false false R58.htm 100570 - Disclosure - Related Party Transactions - Balances of Receivables and Payables with Related Parties (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureRelatedPartyTransactionsBalancesOfReceivablesAndPayablesWithRelatedPartiesDetails Related Party Transactions - Balances of Receivables and Payables with Related Parties (Details) Details 58 false false R59.htm 100580 - Disclosure - Net Income (Loss) Per Share - Reconciliation of Basic and Diluted Net Income (Loss) per Share (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShareReconciliationOfBasicAndDilutedNetIncomeLossPerShareDetails Net Income (Loss) Per Share - Reconciliation of Basic and Diluted Net Income (Loss) per Share (Details) Details http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShareTables 59 false false R60.htm 100590 - Disclosure - Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Earning Per Share (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShareAntidilutiveSecuritiesExcludedFromComputationOfEarningPerShareDetails Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Earning Per Share (Details) Details http://dzsi.com/20220630/taxonomy/role/Role_DisclosureNetIncomeLossPerShareTables 60 false false R61.htm 100600 - Disclosure - Leases - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureLeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 61 false false R62.htm 100610 - Disclosure - Leases - Maturity of Operating Lease Liabilities (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureLeasesMaturityOfOperatingLeaseLiabilitiesDetails Leases - Maturity of Operating Lease Liabilities (Details) Details 62 false false R63.htm 100620 - Disclosure - Commitments and Contingencies - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails Commitments and Contingencies - Additional Information (Details) Details 63 false false R64.htm 100630 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 64 false false R65.htm 100640 - Disclosure - Enterprise-Wide Information - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) Sheet http://dzsi.com/20220630/taxonomy/role/Role_DisclosureEnterpriseWideInformationPropertyPlantAndEquipmentNetOfAccumulatedDepreciationDetails Enterprise-Wide Information - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) Details 65 false false All Reports Book All Reports dzsi-20220630.htm dzsi-20220630.xsd dzsi-20220630_cal.xml dzsi-20220630_def.xml dzsi-20220630_lab.xml dzsi-20220630_pre.xml dzsi-ex31_1.htm dzsi-ex31_2.htm dzsi-ex32_1.htm http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true