Significant Customers - Concentration Risk by Risk Factor of Sales Revenue and Accounts Receivable (Details) - Accounts Receivable - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	[1]
Customer A
Significant customers
Concentration risk, percentage	10.90%
Customer B
Significant customers
Concentration risk, percentage	10.60%

[1] Sales and accounts receivable from Customer A and Customer B in 2020 did not exceed 10% of revenue and total gross accounts receivable.