Contract Assets and Liabilities Changes in Net Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Contract assets
Current	$ 2,072	$ 1,238
Contract assets	2,072	1,238
Contract Liabilities
Current	1,300	953
Non-current	435	293
Contract liabilities	$ 1,735	$ 1,246