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Revenue Recognition - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue Recognition [Line Items]          
Impairment losses $ 0 $ 0 $ 0 $ 0  
Bad-debt expense 0 $ 0 0 $ 0  
Contract assets 0   0   $ 0
Revenue performance obligation 10,400,000   $ 10,400,000    
Remaining performance obligation practical expedient     true    
Concentrate Products          
Revenue Recognition [Line Items]          
Reserve for returns 0   $ 0   $ 0
Baxter Healthcare Organization          
Revenue Recognition [Line Items]          
Revenue performance obligation $ 9,600,000   $ 9,600,000