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Events after balance sheet date (Details) - Subsequent Event
$ in Millions
Jul. 14, 2020
USD ($)
tranche
shares
Convertible Debt  
Subsequent events  
Warrants issued to purchase common stock | shares 190,424
Convertible debt financing arrangement | Pontifax Medison Debt Financing [Member]  
Subsequent events  
Maximum borrowing capacity $ 30
Number of tranches | tranche 3
Maximum borrowing capacity per tranche $ 10
Term of debt 54 months
Debt, interest only payment term 24 months