Balance Sheet Components - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accrued Liabilities Current [Abstract]
Payments due to content publishers	$ 155,175	$ 106,576
Accrued cost of revenue	101,952	98,285
Marketing, retail and merchandising costs	32,681	43,645
Operating lease liability, current	34,723	35,647
Content liability, current	52,536	6,165
Accrued payroll and related expenses	32,523	15,675
Other accrued expenses	72,467	41,675
Total accrued liabilities	$ 482,057	$ 347,668