Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 2,400		$ 2,400		$ 1,700
Bad debt expense	900	$ 300	2,911	$ 2,794
Write-off of uncollectible accounts receivable	$ 900	$ 400	$ 2,200	$ 1,900