Revenue Recognition (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Services revenues	$ 4,639,000	$ 7,026,000
Products revenues	501,000	393,000
Total Net Sales	5,140,000	7,419,000
Products and services transferred over time
Services revenues	3,555,000	7,026,000
Products revenues	0	0
Total Net Sales	3,555,000	7,026,000
Products and services transferred at a point in time
Services revenues	1,084,000	0
Products revenues	501,000	393,000
Total Net Sales	$ 1,585,000	$ 393,000