Quarterly report pursuant to Section 13 or 15(d)

Major suppliers (Details)

v3.20.2
Major suppliers (Details) - Inventory purchases - Supplier concentration risk
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Three vendors    
Concentration Risk [Line Items]    
Concentration risk, percentage 78.00%  
One vendor    
Concentration Risk [Line Items]    
Concentration risk, percentage   85.00%