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Subsequent Events (Details) - Subsequent Event - Merck Convertible Note
1 Months Ended
Oct. 31, 2020
USD ($)
shares
Subsequent Event [Line Items]  
Debt conversion, converted instrument, amount | $ $ 25,000,000
Debt conversion, converted instrument, shares issued (in shares) | shares 6,758,400
Debt conversion, converted instrument, shares issued, trading restriction term 180 days