Balance Sheet Components - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities Current [Abstract]
Accounts payable	$ 32,931	$ 56,413
Accrued royalty expense	5,638	17,165
Accrued inventory	11,206	2,382
Accrued payroll and related expenses	10,181	8,699
Accrued cost of revenue	13,783	12,210
Accrued payments to content publishers	25,209	24,037
Taxes and related liabilities	912	1,463
Customer prepayments	5,255	545
Other accrued expenses	5,911	5,843
Total Accounts Payable and Accrued Liabilities	$ 111,026	$ 128,757