Revenue Recognition (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Services revenues	$ 4,400,000	$ 9,069,000	$ 14,474,000	$ 23,963,000
Products revenues	254,000	386,000	1,162,000	1,156,000
Total Net Sales	4,654,000	9,455,000	15,636,000	25,119,000
Products and services transferred over time
Services revenues	3,401,000	8,016,000	11,099,000	21,883,000
Products revenues	0	0	0	0
Total Net Sales	3,401,000	80,160,000	11,099,000	1,883,000
Products and services transferred at a point in time
Services revenues	999,000	1,053,000	3,375,000	2,080,000
Products revenues	254,000	386,000	1,162,000	1,156,000
Total Net Sales	$ 1,253,000	$ 1,439,000	$ 4,537,000	$ 3,236,000