Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants and At-the-Market Offering Program - Warrants - Valuation Assumptions (Details)

v3.20.4
Offerings of Common Stock and Warrants and At-the-Market Offering Program - Warrants - Valuation Assumptions (Details) - Goldman 2020 Warrant, Purchase Warrant for Common Shares
Dec. 31, 2020
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Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warrants and Rights Outstanding, Valuation Technique us-gaap:ValuationTechniqueOptionPricingModelMember
Measurement Input, Risk Free Interest Rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warrants and Rights Outstanding, Measurement Input 0.002
Measurement Input, Expected Term  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warrants and Rights Outstanding, Measurement Input 3
Measurement Input, Price Volatility  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Warrants and Rights Outstanding, Measurement Input 0.810