Revenue from Contract with Customer (Schedule of Deferred Revenues and Contract Balances) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	$ 98,808	$ 88,848
Total deferred revenue - non-current	54	409
Hosted Services - Business
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	94,107	86,144
Hosted Services - Consumer
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	870	835
Professional Services - Business
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	3,831	1,869
Total deferred revenue - non-current	$ 54	$ 409