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Summary of significant accounting policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2020
Disclosure of summary of significant accounting policies [line items]  
Term of financial liability settlement 12 months
Maturity of cash and cash equivalent three months or less
Material modifications to any share-based payment transactions There were no material modifications to any share-based compensation transactions during 2020, 2019, and 2018
Podcast Publisher Relationships  
Disclosure of summary of significant accounting policies [line items]  
Estimated useful lives 10 years
Bottom of Range | Technology  
Disclosure of summary of significant accounting policies [line items]  
Estimated useful lives 3 years
Bottom of Range | Trade Names and Trademarks  
Disclosure of summary of significant accounting policies [line items]  
Estimated useful lives 3 years
Top of Range  
Disclosure of summary of significant accounting policies [line items]  
Duration podcast content assets expected to be consumed 3 years
Average duration of investment portfolio 2 years
Top of Range | Technology  
Disclosure of summary of significant accounting policies [line items]  
Estimated useful lives 5 years
Top of Range | Trade Names and Trademarks  
Disclosure of summary of significant accounting policies [line items]  
Estimated useful lives 8 years
Property and Equipment | Bottom of Range  
Disclosure of summary of significant accounting policies [line items]  
Expected lease term 1 year
Estimated useful lives 3 years
Property and Equipment | Top of Range  
Disclosure of summary of significant accounting policies [line items]  
Expected lease term 14 years
Estimated useful lives 5 years
Leasehold Improvements  
Disclosure of summary of significant accounting policies [line items]  
Estimated useful lives shorter of the lease term or useful life