Segment Reporting - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total net revenues	$ 2,309	$ 1,366	$ 4,078	$ 2,351
Gross margin	1,367	830	2,365	1,297
Research and development expenses	793	352	1,549	641
Depreciation and amortization expense	48	40	98	81
Selling, general and administrative expenses	1,403	1,091	2,906	2,351
Change in fair value of contingent consideration	(9)		(19)
Total operating expenses	(2,235)	(1,483)	(4,534)	(3,073)
Loss from operations	(868)	(653)	(2,169)	(1,776)
Water Filtration [Member]
Total net revenues	2,309	1,366	4,078	2,351
Gross margin	1,367	830	2,365	1,297
Research and development expenses	433	262	779	451
Depreciation and amortization expense	48	40	98	81
Selling, general and administrative expenses	1,352	1,077	2,821	2,327
Change in fair value of contingent consideration	(9)		(19)
Total operating expenses	(1,824)	(1,379)	(3,679)	(2,859)
Loss from operations	(457)	(549)	(1,314)	(1,562)
Renal Products [Member]
Total net revenues
Gross margin
Research and development expenses	360	90	770	190
Depreciation and amortization expense
Selling, general and administrative expenses	51	14	85	24
Change in fair value of contingent consideration
Total operating expenses	(411)	(104)	(855)	(214)
Loss from operations	$ (411)	$ (104)	$ (855)	$ (214)