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
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average remaining contractual term (in years) 7 years 4 months 24 days 7 years 9 months  
Restricted Stock awards      
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) 8 months 12 days