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Organization and Description of Business (Details)
$ / shares in Units, € in Millions, $ in Millions
9 Months Ended
Nov. 02, 2020
EUR (€)
Nov. 02, 2020
USD ($)
Sep. 30, 2021
segment
Mar. 16, 2021
$ / shares
Feb. 28, 2020
$ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Number of operating segments | segment     2    
Number of reportable segments | segment     2    
0.25% Convertible senior notes due 2026 | Convertible notes          
Business Acquisition [Line Items]          
Conversion price (in usd per share) | $ / shares         $ 91.03
0.50% Convertible senior notes due 2028 | Convertible notes          
Business Acquisition [Line Items]          
Conversion price (in usd per share) | $ / shares       $ 179.27  
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