Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and benefits	$ 21,990	$ 14,970
Accrued expenses	3,650	5,331
Customer refunds and credits	1,560	3,328
Accrued co-location and bandwidth	3,979	2,696
Indemnity holdback	2,187	0
Other	5,264	1,989
Total accrued expenses and other current liabilities	$ 38,630	$ 28,314