Balance Sheet Components - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accrued Liabilities Current [Abstract]
Accounts payable	$ 41,148	$ 56,413
Accrued royalty expense	14,501	17,165
Accrued inventory	3,574	2,382
Accrued payroll and related expenses	9,879	8,699
Accrued cost of revenue	9,577	12,210
Accrued payments to content publishers	23,590	24,037
Taxes and related liabilities	1,218	1,463
Customer prepayments	1,887	545
Other accrued expenses	6,402	5,843
Total Accounts Payable and Accrued Liabilities	$ 111,776	$ 128,757