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Summary of significant accounting policies - Additional Information (Details) | 12 Months Ended
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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

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