Quarterly report pursuant to Section 13 or 15(d)

Warrant Liabilities - Weighted-average key assumptions (Details)

v3.20.2
Warrant Liabilities - Weighted-average key assumptions (Details)
Jun. 03, 2020
Mar. 03, 2020
Jan. 07, 2020
Dec. 31, 2019
January 2020 Private Placement Warrant | Expected volatility        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding 124   121  
January 2020 Private Placement Warrant | Risk-free interest rate        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding 0.8   1.6  
January 2020 Private Placement Warrant | Dividend yield        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding 0.0   0.0  
January 2020 Private Placement Warrant | Expected term (in years)        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding 4.9   5.0  
January 2020 Private Placement Warrant | Weighted-average fair value per share warrant        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding 0.26   0.19  
August 2019 Placement Warrants | Expected volatility        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding   124   125
August 2019 Placement Warrants | Risk-free interest rate        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding   0.8   1.7
August 2019 Placement Warrants | Dividend yield        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding   0.0   0.0
August 2019 Placement Warrants | Expected term (in years)        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding   4.5   4.6
August 2019 Placement Warrants | Weighted-average fair value per share warrant        
Class of Warrant or Right [Line Items]        
Warrants and rights outstanding   0.21   0.11