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Funding Arrangements (Details) - CARB-X program - USD ($)
1 Months Ended 3 Months Ended 8 Months Ended
Sep. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Oct. 31, 2017
Dec. 31, 2019
Funding Arrangements          
Grant income recognized   $ 13,000 $ 800,000    
Funds received during the period   400,000 $ 600,000    
Grants receivable   $ 900,000     $ 1,200,000
Maximum          
Funding Arrangements          
Reimbursable research expenditures $ 16,800,000     $ 16,400,000