Property and Equipment (Schedule of Depreciation Expense Associated Income Statement Line Items) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Depreciation expense	$ 1,000	$ 1,461	$ 3,446	$ 4,382
Cost of product sales [Member]
Depreciation expense	258	682	1,341	2,015
Cost of services [Member]
Depreciation expense	251	320	811	951
Selling, general and administrative expenses [Member]
Depreciation expense	$ 491	$ 459	$ 1,294	$ 1,416