Revenue Recognition (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Services revenues									$ 31,623,000	$ 24,911,000
Products revenues									1,613,000	1,519,000
Total Net Sales	$ 8,117,000	$ 9,455,000	$ 8,245,000	$ 7,419,000	$ 8,091,000	$ 7,723,000	$ 5,849,000	$ 4,767,000	33,236,000	$ 26,430,000
Products and services transferred over time
Services revenues									28,598,000
Products revenues									0
Total Net Sales									28,598,000
Products and services transferred at a point in time
Services revenues									3,025,000
Products revenues									1,613,000
Total Net Sales									$ 4,638,000