Annual report pursuant to Section 13 and 15(d)

Certain Risks and Concentrations (Details)

v3.6.0.2
Certain Risks and Concentrations (Details) - Major Suppliers [Member]
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
A (Hong Fa Shipping Limited, a related party) [Member]      
Concentration Risk [Line Items]      
Concentration risk, Percentage 44.00% 30.00% 23.00%
B (Hai Yi Shipping Limited, a related party) [Member]      
Concentration Risk [Line Items]      
Concentration risk, Percentage 25.00% 14.00% [1]
C [Member]      
Concentration Risk [Line Items]      
Concentration risk, Percentage 13.00% [1] [1]
D (PT Avona Mina Lestari, a related party)      
Concentration Risk [Line Items]      
Concentration risk, Percentage [1] 34.00% [1]
E (Hong Long, a related party)      
Concentration Risk [Line Items]      
Concentration risk, Percentage [1] 11.00% 44.00%
F [Member]      
Concentration Risk [Line Items]      
Concentration risk, Percentage [1] [1] 10.00%
[1] less than 10%