Quarterly report pursuant to Section 13 or 15(d)

Customer Concentration (Details)

v3.20.2
Customer Concentration (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue | Major customers        
Concentration Risk [Line Items]        
Concentration risk, percentage 55.40% 53.40% 48.90% 53.60%