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STOCKHOLDERS' EQUITY - Fair value assumptions (Details) - Common Stock Warrants
Mar. 31, 2021
Class of Warrant or Right [Line Items]  
Expected term (years) 4 years 10 months 24 days
Expected term (years)  
Class of Warrant or Right [Line Items]  
Expected term (years) 5 years
Risk-free interest rate  
Class of Warrant or Right [Line Items]  
Warrants measurement input 0.60
Expected volatility  
Class of Warrant or Right [Line Items]  
Warrants measurement input 54
Expected dividend yield  
Class of Warrant or Right [Line Items]  
Warrants measurement input 0