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Assets and Liabilities Held for Sale and Discontinued Operations - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 05, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
DZS, Inc | Affiliated Entity | Dasan Networks, Inc.            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
DNI direct ownership interest   23.90%   23.90%    
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash proceeds from divestiture $ 3.8          
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Accounts payable   $ 10.2   $ 10.2    
Other receivables   0.7   0.7    
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea | Master Engineering Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Annual purchase commitment $ 2.5          
Term of service agreement 7 years          
Term of service agreement renewal 12 months          
Expiration period 3 years          
Required notice of termination 180 days          
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea | Master Supply Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Term of service agreement 3 years          
Term of service agreement renewal 1 year          
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea | Reseller Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Term of service agreement 7 years          
Term of service agreement renewal 12 months          
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea | Master Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Term of service agreement 1 year          
Term of service agreement renewal 12 months          
Required notice of termination 60 days          
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea | Transition Services Agreement And Master Engineering Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Services agreement, expenses incurred   0.6   1.2    
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNS Korea | Transition Services Agreement            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Services agreement, expenses incurred   0.2   0.4    
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNI Loan Agreements            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Debt eliminated in divestiture $ 34.3          
Disposal Group, Held-for-Sale, Not Discontinued Operations | DASAN Network Solutions, Inc., D-Mobile Limited, DZS Vietnam, Dasan India Private Limited and DZS Japan | DNI Loan Agreements | Investor            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net revenue   0.4 $ 0.2 0.4 $ 0.5  
Cost of revenue   $ 0.3 $ 0.2 $ 0.3 $ 0.4  
Long-term debt classified as held-for-sale           $ 30.6