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Intangible assets, net
 12 Months Ended
Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible assets, net
15.
Intangible assets, net
 
The following table summarizes the Group’s intangible assets:
 
 
 
December 31,
 
 
 
2017
 
 
2018
 
 
 
RMB
 
 
RMB
 
 
 
 
 
 
 
 
Gross carrying amount
 
 
 
 
 
 
 
 
Operating rights
 
 
47,020
 
 
 
67,080
 
Software
 
 
34,413
 
 
 
39,535
 
License
 
 
-
 
 
 
32,000
 
Domain names
 
 
25,774
 
 
 
26,819
 
Technology
 
 
17,676
 
 
 
18,094
 
 
 
 
 
 
 
 
 
 
Total of gross carrying amount
 
 
124,883
 
 
 
183,528
 
 
 
 
 
 
 
 
 
 
Less: accumulated amortization
 
 
 
 
 
 
 
 
Operating rights
 
 
(40,320
)
 
 
(48,451
)
Software
 
 
(19,448
)
 
 
(28,406
)
License
 
 
-
 
 
 
(1,422
)
Domain names
 
 
(9,687
)
 
 
(11,213
)
Technology
 
 
(10,695
)
 
 
(11,856
)
 
 
 
 
 
 
 
 
 
Total accumulated amortization
 
 
(80,150
)
 
 
(101,348
)
 
 
 
 
 
 
 
 
 
Less: accumulated impairment
 
 
(7,252
)
 
 
(7,495
)
 
 
 
 
 
 
 
 
 
Intangible assets, net
 
 
37,481
 
 
 
74,685
 
 
Amortization expense for the years ended December 31, 2016, 2017 and 2018 were RMB56,977, RMB14,510 and RMB20,995, respectively.
 
The estimated amortization expenses for each of the following five years are as follows:
 
 
 
Amortization expense

of intangible assets
 
 
 
RMB
 
 
 
 
 
2019
 
 
22,710
 
2020
 
 
13,010
 
2021
 
 
4,563
 
2022
 
 
4,060
 
2023
 
 
3,978
 
 
The weighted average amortization periods of intangible assets as of December 31, 2017 and 2018 are as below:
 
 
 
December 31,
 
 
2017
 
 
2018
 
 
 
 
 
 
Domain names
 
 
15 years
 
 
 
15 years
License
 
 
Not applicable
 
 
 
15 years
Software
 
 
4 years
 
 
 
4 years
Operating rights
 
 
1 year
 
 
 
2 year
Technology
 
 
5 years
 
 
 
Not applicable