Quarterly report pursuant to Section 13 or 15(d)

Certain Risks and Concentrations (Details)

v3.10.0.1
Certain Risks and Concentrations (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Major customers [Member] | A [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 33.00% [1] 21.00% 10.00%
Major customers [Member] | B [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 15.00% [1] 19.00% [1]
Major customers [Member] | C [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 12.00% 20.00% 13.00% 11.00%
Major suppliers [Member] | A [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 31.00% [1] 27.00% [1]
Major suppliers [Member] | B [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 21.00% 64.00% 19.00% [1]
Major suppliers [Member] | C (Hong Long, a related party) [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 14.00% 13.00% [1] 29.00%
Major suppliers [Member] | D [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 12.00% [1] 12.00% [1]
Major suppliers [Member] | E (Hong Fa Shipping Limited, a related party) [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage [1]
Major suppliers [Member] | F (Hai Yi Shipping Limited, a related party) [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage [1] [1] [1] 10.00%
[1] less than 10%