Financial Statements Details - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of year	$ 659	$ 638	$ 507
Additions charged to expense	(154)	397	221
Deductions/write-offs	(373)	(376)	(90)
Balance at the end of year	$ 132	$ 659	$ 638