Quarterly report pursuant to Section 13 or 15(d)

Warrant Liabilities - Weighted-average key assumptions (Details)

v3.20.1
Warrant Liabilities - Weighted-average key assumptions (Details)
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