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Intangible assets
 12 Months Ended
Dec. 31, 2018
Intangible Assets [Abstract]  
Intangible assets
Intangible assets
 
Changes in the Group’s intangible assets in 2018 and 2017 were as follows:
 
Goodwill
 
Software
 
Others
 
Total
At January 1, 2017
 

 
 

 
 

 
 

Cost
13,405

 
5,406

 
2,671

 
21,482

Accumulated amortization
—

 
(2,505
)
 
(1,725
)
 
(4,230
)
Net book amount
13,405

 
2,901

 
946

 
17,252

Year ended December 31, 2017
 

 
 

 
 

 
 
Opening net book amount
13,405

 
2,901

 
946

 
17,252

Exchange differences
(993
)
 
(244
)
 
(10
)
 
(1,247
)
Additions
—

 
2,089

 
34

 
2,123

Amortization charge (i)
—

 
(895
)
 
(41
)
 
(936
)
Closing net book amount
12,412

 
3,851

 
929

 
17,192

At December 31, 2017
 

 
 

 
 

 
 
Cost
12,412

 
7,251

 
2,695

 
22,358

Accumulated amortization
—

 
(3,400
)
 
(1,766
)
 
(5,166
)
Net book amount
12,412

 
3,851

 
929

 
17,192

Year ended December 31, 2018
 

 
 

 
 

 
 
Opening net book amount
12,412

 
3,851

 
929

 
17,192

Adjustment of opening net book amount for the application of IAS 29 (Note 33)
15,554

 
836

 
—

 
16,390

Exchange differences
(6,616
)
 
(1,139
)
 
(20
)
 
(7,775
)
Additions
—

 
3,217

 
105

 
3,322

Amortization charge (i)
—

 
(1,168
)
 
(52
)
 
(1,220
)
Closing net book amount
21,350

 
5,597

 
962

 
27,909

At December 31, 2018
 

 
 

 
 

 
 
Cost
21,350

 
10,163

 
2,781

 
34,294

Accumulated amortization
—

 
(4,566
)
 
(1,819
)
 
(6,385
)
Net book amount
21,350

 
5,597

 
962

 
27,909

 
(i)
Amortization charges are included in “General and administrative expenses” and “Selling expenses” for the years ended December 31, 2018 and 2017, respectively. There were no impairment charges for any of the years presented (see Note 32 (a)).