Revenue From Contracts With Customers (Schedule of Receivables, Contract Assets and Deferred Revenue) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Trade accounts receivable	$ 24,713	$ 12,939
Contract assets, which are included in “Prepaid expenses and other current assets”	1,689	1,310
Contract assets, long-term, which are included in “Other assets”	1,832	1,375
Deferred revenue (current)	11,282	5,482
Deferred revenue (non-current)	$ 1,819	$ 1,709