Quarterly report pursuant to Section 13 or 15(d)

Warrants - Series F warrant liability (Details)

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Warrants - Series F warrant liability (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 17, 2020
Dec. 19, 2019
Nov. 04, 2019
Oct. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]                
Issued (in shares) 1,003,232 937,500 11,000   570,258 1,990,624 3,288,400 49,928,469
Warrants, exercise price (in dollars per share) $ 1.62 $ 5.00 $ 5.00   $ 0.65 $ 0.75    
Term of warrants   24 months 24 months          
Series F Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Adjustment to additional paid-in capital for discount on preferred stock       $ 14.6        
Series F Warrants                
Class of Warrant or Right [Line Items]                
Issued (in shares)       43,403,130        
Warrants, exercise price (in dollars per share)       $ 0.75        
Term of warrants       72 months