Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 1,500		$ 1,500		$ 500
Bad debt expense	300	$ 400	2,794	$ 861
Write-off of uncollectible accounts receivable	$ 400	$ 400	$ 1,900	$ 400