Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
QUARTERLY FINANCIAL INFORMATION (UNAUDITED) [Abstract]
Revenues		$ 16,852	$ 12,391	$ 15,044	$ 14,976	$ 18,063	$ 16,683	$ 15,854	$ 14,120	$ 59,263	$ 64,720
Gross margin		7,181	5,506	6,589	7,026	7,692	7,436	7,264	6,219	26,302	28,611
Income (loss) from operations		544	(757)	579	570	1,473	1,329	875	(318)	936	3,359
Net income (loss)		$ 168	$ (353)	$ 464	$ 495	$ 1,193	$ 1,067	$ 740	$ (173)	$ 774	$ 2,827
Net income (loss) per share - Basic (in usd per share)	[1]	$ 0.02	$ (0.05)	$ 0.07	$ 0.07	$ 0.17	$ 0.15	$ 0.11	$ (0.02)	$ 0.11	$ 0.40
Net income (loss) per share - Diluted (in usd per share)	[1]	$ 0.02	$ (0.05)	$ 0.06	$ 0.07	$ 0.16	$ 0.15	$ 0.10	$ (0.02)	$ 0.11	$ 0.39

[1] The summation of quarterly per share amounts may not equal the calculation for the full year, as each quarterly calculation is performed discretely.