Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts Receivable
Trade accounts receivable	$ 59,487	$ 50,042
Unbilled accounts receivable	11,852	10,997
Accounts receivable, gross	71,339	61,039
Less allowance for doubtful accounts	(162)	(86)
Accounts receivable, net	$ 71,177	$ 60,953