Revenues (Disaggregation of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 16,312	$ 60,773	$ 79,594	$ 153,391
Product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues	11,660	43,756	55,948	110,933
Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	4,652	17,017	23,646	42,458
United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,335	28,554	34,907	80,642
United States [Member] | Product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues	8,192	21,639	29,319	62,272
United States [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,143	6,915	5,588	18,370
Canada [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,693	26,121	34,559	62,623
Canada [Member] | Product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,762	18,531	24,740	43,953
Canada [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	931	7,590	9,819	18,670
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Revenues	3,284	6,098	10,128	10,126
Other Countries [Member] | Product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues	706	3,586	1,889	4,708
Other Countries [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 2,578	$ 2,512	$ 8,239	$ 5,418