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Organization and Description of Business (Details)
€ in Millions, $ in Millions
3 Months Ended
Nov. 02, 2020
EUR (€)
Nov. 02, 2020
USD ($)
Mar. 31, 2021
segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of operating segments     2
Number of reportable segments     2
Voxbone S.A      
Business Acquisition [Line Items]      
Total purchase consideration | € € 446    
Fair value of cash paid 338 $ 400  
Voxbone S.A | Common stock      
Business Acquisition [Line Items]      
Fair value of Bandwidth common stock issued € 108 $ 128