Balance Sheet Components - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]
Accounts payable	$ 77,416	$ 56,576
Payments due to content publishers	55,096	32,463
Accrued cost of revenue	33,889	22,830
Operating lease liability, current	16,600
Accrued royalty expense	11,239	7,939
Accrued payroll and related expenses	11,074	12,217
Accrued inventory	10,497	6,008
Accrued capital expenditures	5,973
Marketing, retail and merchandising costs	5,777
Accrued legal fees	4,298
Customer prepayments	2,376	3,124
Taxes and related liabilities	1,160	1,314
Other accrued expenses	6,124	6,091
Total Accounts Payable and Accrued Liabilities	$ 241,519	$ 148,562