Balance Sheet Components - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts
Beginning balance	$ 4,220	$ 2,919	$ 1,788
Cumulative-effect adjustment upon adoption of ASU 2016-13	(1,394,836)	(929,318)
Provision for credit losses	(156)	1,354	1,141
Write-offs	(1,635)	(457)	(10)
Total	$ 2,429	4,220	$ 2,919
Cumulative effect adjustment | Adoption Adjustment
Allowance for doubtful accounts
Cumulative-effect adjustment upon adoption of ASU 2016-13		$ 404