Quarterly report pursuant to Section 13 or 15(d)

Certain Risks and Concentrations (Details)

v3.7.0.1
Certain Risks and Concentrations (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Major suppliers [Member] | A (Hai Yi Shipping Limited, a related party) [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage [1] [1] 11.00% 22.00%
Major suppliers [Member] | B (Hong Fa Shipping Limited, a related party) [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 42.00% 97.00% 40.00% 64.00%
Major suppliers [Member] | C (Hong Long, a related party) [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 38.00% [1] 31.00% [1]
Major suppliers [Member] | D [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 18.00% [1] [1] [1]
Major customers [Member] | A [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage [1] 16.00% [1] [1]
Major customers [Member] | B [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage [1] 14.00% [1] [1]
Major customers [Member] | C [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage [1] 10.00% [1] [1]
Major customers [Member] | D [Member]        
Concentration Risk [Line Items]        
Concentration risk, Percentage 11.00% [1] [1] [1]
[1] less than 10%