Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Weighted-average assumptions fair value of the stock options and warrants (Details)

v3.21.1
STOCKHOLDERS' EQUITY - Weighted-average assumptions fair value of the stock options and warrants (Details)
Mar. 31, 2021
Feb. 17, 2021
Market price of Common Stock    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 7.06 11.99
Market price of Common Stock | Stock Options    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 7.06 11.99
Market price of Common Stock | Warrants    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 7.06 11.99
Exercise price    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 65.75 70.48
Exercise price | Stock Options    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 70.48 84.19
Exercise price | Warrants    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 63.84 63.88
Risk-free interest rate    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 0.4 0.3
Risk-free interest rate | Stock Options    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 1.0 0.6
Risk-free interest rate | Warrants    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 0.2 0.1
Dividend rate    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 0.0 0.0
Dividend rate | Stock Options    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 0.0 0.0
Dividend rate | Warrants    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 0.0 0.0
Remaining contractual term (years)    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 2.5 2.5
Remaining contractual term (years) | Stock Options    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 5.3 4.6
Remaining contractual term (years) | Warrants    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 1.4 1.5
Historical volatility    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 113.9 119.9
Historical volatility | Stock Options    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 118.4 112.6
Historical volatility | Warrants    
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]    
Fair value of stock options and warrants 112.0 123.5