Represents the typical credit period from the invoice date, after which unpaid accounts are individually analyzed for collectability in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Nature of Business and Basis of Presentation, Nature of Business, Going Concern, Accounts Receivable and Inventories (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended	23 Months Ended
	Jan. 31, 2019	Dec. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018	Jun. 30, 2019 USD ($)	Jun. 30, 2018	Dec. 31, 2018 USD ($)	Mar. 12, 2019 USD ($)	Aug. 31, 2016 USD ($)
Nature of Business [Abstract]
Reverse stock split ratio	0.0714
Going Concern [Abstract]
Accumulated deficit		$ (199,388)	$ (208,545)		$ (208,545)		$ (199,388)
Net proceeds from issuance of convertible preferred stock								$ 39,800
Accounts Receivable [Abstract]
Accounts receivables maximum credit period from invoice date					30 days
Allowance for doubtful accounts		0	0		$ 0		0
Inventories [Abstract]
Finished Goods		517	465		465		517
Work in Process		34	96		96		34
Raw Materials		1,107	1,129		1,129		1,107
Total		$ 1,658	1,690		1,690		$ 1,658
Contingent Consideration [Abstract]
Fair value of contingent consideration			0		0
Contingent consideration			$ 0		$ 0
Customer One [Member] \| Accounts Receivable [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage					23.00%		18.00%
Customer Two [Member] \| Accounts Receivable [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage							13.00%
Customer Three [Member] \| Accounts Receivable [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage							13.00%
Minimum [Member]
Nature of Business [Abstract]
Reverse stock split ratio		0.5000
Maximum [Member]
Nature of Business [Abstract]
Reverse stock split ratio		0.0714
Aquadex Product Line [Member]
Contingent Consideration [Abstract]
Contingent consideration									$ 126
ASC 606 [Member] \| Customer One [Member] \| Net Sales [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage			20.00%	17.00%	12.00%	11.00%
ASC 606 [Member] \| Customer Two [Member] \| Net Sales [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage						11.00%