Annual report pursuant to Section 13 and 15(d)

CONCENTRATION - Supplier Concentrations (Details)

v3.21.1
CONCENTRATION - Supplier Concentrations (Details) - Cost of goods sold - Supplier Concentrations
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CONCENTRATIONS    
Concentration risk (as a percent) 31.83% 81.09%
Supplier B    
CONCENTRATIONS    
Concentration risk (as a percent) 15.51%  
Supplier C    
CONCENTRATIONS    
Concentration risk (as a percent)   81.09%
Supplier D    
CONCENTRATIONS    
Concentration risk (as a percent) 16.32%