Schedule II - Valuation and Qualifying Accounts (Details) - Accounts receivable allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 604	$ 418	$ 251
Charged/(Credited) to costs and expenses, additions and deductions	72	207	167
Charged to other accounts, additions and deductions	0	0	0
Uncollectible accounts written-off	22	21	0
Balance at end of period	$ 654	$ 604	$ 418