Quarterly Selected Financial Data (Unaudited) - Schedule of Quarterly Financial Information (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	Dec. 31, 2016
Quarterly Financial Data Disclosure [Line Items]
Revenues	$ 11,491,000	$ 13,385,000	$ 14,809,000	$ 13,379,000	$ 11,167,000	$ 11,086,000	$ 10,706,000	$ 7,999,000
Cost of goods and services sold	5,367,000	6,588,000	8,394,000	6,917,000	5,558,000	5,459,000	5,165,000	3,849,000	$ 27,266,000	$ 20,031,000	$ 18,528,000
Gross Profit	6,124,000	6,797,000	6,415,000	6,462,000	5,609,000	5,627,000	5,541,000	4,150,000	25,798,000	20,927,000	18,294,000
Selling, general and administrative expenses	7,061,000	5,921,000	5,993,000	5,696,000	5,718,000	5,063,000	5,046,000	4,653,000	24,671,000	20,480,000	19,427,000
Research and development expenses	1,882,000	1,696,000	1,542,000	1,743,000	1,066,000	1,108,000	997,000	1,367,000	6,863,000	4,538,000	5,235,000
Other income, net	10,000	(77,000)	4,000	(13,000)	(10,000)	(42,000)	(22,000)	(16,000)	(165,000)	(1,000)	6,000
Net loss before income tax benefit					(1,185,000)	(586,000)	(524,000)	(1,886,000)	(5,812,000)	(4,181,000)	(6,370,000)
Income tax benefit - sale of NJ R&D tax credits					311,000					311,000
Net loss	$ 2,809,000	$ 897,000	$ (1,116,000)	$ (990,000)	$ (874,000)	$ (586,000)	$ (524,000)	$ (1,886,000)	$ (5,812,000)	$ (3,870,000)	$ (6,370,000)
Net loss per share - basic and diluted	$ (0.16)	$ (0.05)	$ (0.07)	$ (0.06)	$ (0.05)	$ (0.04)	$ (0.04)	$ (0.14)	$ (0.34)	$ (0.26)	$ (0.49)
Products [Member]
Quarterly Financial Data Disclosure [Line Items]
Revenues	$ 7,171,000	$ 9,044,000	$ 10,784,000	$ 9,898,000	$ 6,353,000	$ 6,490,000	$ 6,375,000	$ 4,334,000
Cost of goods and services sold	4,101,000	5,287,000	7,408,000	5,842,000	3,736,000	3,475,000	3,427,000	2,815,000	$ 22,638,000	$ 13,453,000	$ 14,036,000
Service [Member]
Quarterly Financial Data Disclosure [Line Items]
Revenues	4,320,000	4,341,000	4,025,000	3,481,000	4,814,000	4,596,000	4,331,000	3,665,000
Cost of goods and services sold	$ 1,266,000	$ 1,301,000	$ 986,000	$ 1,075,000	$ 1,822,000	$ 1,984,000	$ 1,738,000	$ 1,034,000	$ 4,628,000	$ 6,578,000	$ 4,492,000