Quarterly report pursuant to Section 13 or 15(d)

CONCENTRATION - Customer Concentrations (Details)

v3.21.1
CONCENTRATION - Customer Concentrations (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue      
CONCENTRATIONS      
Concentration risk (as a percent) 102.40% 94.10%  
Revenue | Customer A      
CONCENTRATIONS      
Concentration risk (as a percent) 102.40%    
Revenue | Customer B      
CONCENTRATIONS      
Concentration risk (as a percent)   55.70%  
Revenue | Customer C      
CONCENTRATIONS      
Concentration risk (as a percent)   38.40%  
Accounts Receivable | Customer Concentrations      
CONCENTRATIONS      
Concentration risk (as a percent) 83.43%   89.02%
Accounts Receivable | Customer Concentrations | Customer A      
CONCENTRATIONS      
Concentration risk (as a percent) 83.43%   89.02%