Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Summary of Stock Options Pricing (Details)

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SHARE-BASED COMPENSATION - Summary of Stock Options Pricing (Details) - Stock Option
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Expected volatility 68.74% 70.98%
Risk-free interest rate 0.48% 1.39%
Expected life (years) 5 years 5 years