Quarterly report pursuant to Section 13 or 15(d)

Certain Risks and Concentrations (Details)

v3.19.2
Certain Risks and Concentrations (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Major Customers [Member] | Customer A [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 22.00% 20.00% 22.00% 22.00%
Major Customers [Member] | Customer B [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 18.00% [1] 17.00% [1]
Major Customers [Member] | Customer C [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 12.00% 18.00% 14.00% 13.00%
Major Customers [Member] | Customer D [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 12.00% 10.00% 11.00% 11.00%
Major Suppliers [Member] | Supplier A [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 56.00% 31.00% 55.00% 32.00%
[1] less than 10%