Revenue from Contract with Customer (Schedule of Deferred Revenues and Contract Balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	$ 84,494	$ 98,808	$ 88,848
Total deferred revenue - non-current	174	54	$ 409
Hosted Services - Business
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	83,561	94,107
Hosted Services - Consumer
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	0	870
Hosted Services - Consumer | Disposal Group, Not Discontinued Operations
Disaggregation of Revenue [Line Items]
Reclassifed to held-for-sale	800
Professional Services - Business
Disaggregation of Revenue [Line Items]
Total deferred revenue - current	933	3,831
Total deferred revenue - non-current	$ 174	$ 54