Segment Reporting - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total net revenues	$ 3,095	$ 1,724	$ 7,173	$ 4,075
Gross margin	1,819	952	4,184	2,249
Research and development expenses	777	352	2,326	993
Depreciation and amortization expense	44	42	142	123
Selling, general and administrative expenses	1,787	1,069	4,693	3,420
Change in fair value of contingent consideration	(94)		(113)
Total operating expenses	2,514	1,463	7,048	4,536
Loss from operations	(695)	(511)	(2,864)	(2,287)
Water Filtration [Member]
Total net revenues	3,095	1,724	7,173	4,075
Gross margin	1,819	952	4,184	2,249
Research and development expenses	411	147	1,190	598
Depreciation and amortization expense	44	42	142	123
Selling, general and administrative expenses	1,756	970	4,577	3,298
Change in fair value of contingent consideration	(94)		(113)
Total operating expenses	2,117	(1,159)	5,796	(4,019)
Loss from operations	(298)	(207)	(1,612)	(1,770)
Renal Products [Member]
Total net revenues
Gross margin
Research and development expenses	366	205	1,136	395
Depreciation and amortization expense
Selling, general and administrative expenses	31	99	116	122
Change in fair value of contingent consideration
Total operating expenses	397	(304)	1,252	(517)
Loss from operations	$ (397)	$ (304)	$ (1,252)	$ (517)