Balance Sheet Components - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current portion	$ 38,543	$ 42,950	$ 34,501
Deferred revenue, non-current	13,376	$ 12,023	48,511
Total Deferred Revenue (See Note 12)	51,919		83,012
Platform
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current portion	23,681		19,022
Deferred revenue, non-current	8,300		42,674
Player
Deferred Revenue Arrangement [Line Items]
Deferred revenue, current portion	14,862		15,479
Deferred revenue, non-current	$ 5,076		$ 5,837