Quarterly Financial Information (Schedule of Quarterly Financial Information) (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 [Abstract]
Revenues	$ 7,334	$ 7,919	$ 5,361	$ 6,112	$ 5,435	$ 6,867	$ 7,066	$ 6,867	$ 26,726	$ 26,235
Gross profit	2,676	2,491	225	1,336	(471)	2,379	106	1,980	6,728	3,994
Net (loss) income before income tax	(207)	(315)	(2,337)	(1,439)	(2,459)	63	(5,065)	(2,081)	(4,298)	(9,542)
Net income (loss)	$ (207)	$ (315)	$ (2,337)	$ (1,439)	$ (2,459)	$ 63	$ (5,065)	$ (2,081)	$ (4,298)	$ (9,542)
Net loss per share: Basic	$ 0.00	$ (0.01)	$ (0.05)	$ (0.03)	$ (0.05)	$ 0.00	$ (0.11)	$ (0.05)	$ (0.09)	$ (0.21)
Net loss per share: Diluted	$ 0.00	$ (0.01)	$ (0.05)	$ (0.03)	$ (0.05)	$ 0.00	$ (0.11)	$ (0.05)	$ (0.09)	$ (0.21)
Weighted average common shares outstanding - Basic	49,316,852	49,173,773	48,817,940	45,161,273	45,161,273	45,149,717	45,111,273	42,255,189	48,132,714	44,429,114
Weighted average number of shares outstanding - diluted	49,316,852	49,173,773	48,817,940	45,161,273	45,161,273	45,265,370	45,111,273	42,255,189	48,132,714	44,429,114
Change in fair value of common stock warrant liability									$ 1,474	$ 2,194