Balance Sheet Components - Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Distribution fees	$ 17,555	$ 20,360
Prefunded liability	4,937	5,429
Marketing expenses	3,077	2,164
Operating lease liabilities	2,785	3,168
Traffic acquisition cost	1,690	5,278
Interest payable	1,157	282
Liability related to purchased intangible asset	1,000	1,000
Other	11,564	12,351
Total other current liabilities	$ 43,765	$ 50,032