STOCKHOLDERS' EQUITY - Fair value assumptions (Details) - Common Stock Warrants |
Mar. 31, 2021 |
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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 |