Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 1,600		$ 1,600		$ 500
Bad debt expense	300	$ 200	2,493	$ 451
Write-off of uncollectible accounts receivable	$ (900)	$ (100)	$ (1,400)	$ (100)