Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss
Balance, beginning of year	$ 1,316	$ 1,527
Charges to provision for doubtful accounts, net of recoveries	(127)	652
Write-offs	(530)	(863)
Balance, end of year	$ 659	$ 1,316