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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventory [Line Items]    
Raw Materials $ 3,152 $ 3,112
Work in Process 312 172
Finished Goods 1,978 1,805
Total 5,442 5,089
Inventory, noncurrent 1,325 1,176
Inventory, net 4,117 $ 3,913
Triferic Inventory    
Inventory [Line Items]    
Raw Materials 900  
Inventory, noncurrent 1,300  
Inventory, gross 2,500  
Inventory, reserve 800  
Inventory, net 1,700  
Triferic Dialysate    
Inventory [Line Items]    
Finished Goods 300  
Triferic API    
Inventory [Line Items]    
Inventory, net $ 500