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Contractual Agreements (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Contract Research And Development [Member]        
Schedule of Contractual Agreements [Line Items]        
Other Research and Development Expense $ 1,200,000 $ 887,000 $ 4,000,000 $ 2,500,000
Abbott Products, Inc. [Member] | Collaborative Arrangement [Member]        
Schedule of Contractual Agreements [Line Items]        
Collaborative Arrangement, Royalties, Maximum Amount     $ 1,000,000  
Collaborative Arrangement, Royalties, Percentage of Reduction     50.00%  
Collaborative Arrangement, Royalties, Percentage of Net Sales     1.00%