Registration of securities issued in business combination transactions

FAIR VALUE MEASUREMENTS - Initial measurement (Details)

v3.21.1
FAIR VALUE MEASUREMENTS - Initial measurement (Details)
 3 Months Ended
Oct. 22, 2019
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Price of warrant $ 0.33            
Aggregate values of warrants issued | $ $ 1,356,300 $ 2,260,500 $ 1,027,500 $ 3,452,400 $ 2,548,200 $ 2,383,800 $ 1,972,800
Risk-free interest rate              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input 1.61     0.28     1.70
Dividend yield              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input 0.00     0.00     0.00
Implied volatility              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input 7.3     15.4     8.6
Exercise price              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input 11.50     11.50     11.50
Market Stock Price              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input 9.80     10.20     9.80
Private Placement Warrants              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Price of warrant   $ 0.55 $ 0.25        
Aggregate values of warrants issued | $ $ 1,400,000 $ 2,260,500 $ 1,027,500 $ 3,452,400     $ 1,972,800
Private Placement Warrants | Risk-free interest rate              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input   0.62 0.37        
Private Placement Warrants | Dividend yield              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input   0.00 0.00        
Private Placement Warrants | Implied volatility              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input   12.6 8.8        
Private Placement Warrants | Exercise price              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input   11.50 11.50        
Private Placement Warrants | Market Stock Price              
Fair Value Measurement Inputs and Valuation Techniques [Line Items]              
Input   10.00 9.68