Inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Raw Materials	$ 3,112	$ 2,471
Work in Process	172	185
Finished Goods	1,805	1,432
Total	5,089	4,088
Inventory, non-current	1,176	441
Increase (decrease) in inventory reserves and write-offs, net		1,300
Inventory, net	3,913	3,647
Triferic Inventory
Inventory [Line Items]
Raw Materials	890
Inventory, non-current	1,200	400
Inventory, gross	3,900	3,500
Inventory, reserve	2,600	$ 2,800
Increase (decrease) in inventory reserves and write-offs, net	(100)
Increase in inventory reserves and write offs	300
Decrease in inventory reserves and write offs	400
Inventory, net	$ 1,300
Inventory, raw materials, useful life	25 years
Triferic Dialysate
Inventory [Line Items]
Finished Goods	$ 100
Triferic API
Inventory [Line Items]
Inventory, net	$ 300