Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Restricted Stock Agreements (Details)

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STOCKHOLDERS' EQUITY - Restricted Stock Agreements (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2015
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price       $ 3.34
Weighted-average remaining contractual term (in years) 7 years 6 months 3 days 7 years 9 months    
Unvested restricted stock units outstanding        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued     34,010,977  
Share price     $ 0.0001  
Weighted-average remaining contractual term (in years) 1 year