Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details) - item
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Number of vendors 4 3
Inventory, percentage 62.00% 23.00%