Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Significant unobservable inputs (Details)

v3.21.2
FAIR VALUE MEASUREMENTS - Significant unobservable inputs (Details) - Contingent Payment Warrant
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
FAIR VALUE MEASUREMENTS    
Warrants outstanding $ 3,800,000 $ 0
Discount rate    
FAIR VALUE MEASUREMENTS    
Measurement input 0.30