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Intangible assets, net | 12 Months Ended
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Dec. 31, 2017
Intangible assets, net |
Intangible assets, net | 13. Intangible assets, net Intangible assets, net, consist of the following:
|  | As of December 31, 2016 |
|  | Weighted- Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Impairment Amount |  | Net Carrying Amount |
|  | Year |  | RMB |  | RMB |  | RMB |  | RMB |
Strategic Cooperation |  | 5.0 |  | 6,075,289 |  | (3,348,899 | ) | — |  | 2,726,390 |
Non-compete |  | 8.0 |  | 2,467,005 |  | (576,654 | ) | — |  | 1,890,351 |
Technology |  | 6.7 |  | 682,685 |  | (85,168 | ) | (69,922 | ) | 527,595 |
Domain names and trademark |  | 19.6 |  | 3,224,832 |  | (112,173 | ) | (27,124 | ) | 3,085,535 |
Others |  | 6.2 |  | 203,634 |  | (63,185 | ) | (59,663 | ) | 80,786 |
Total |  | 9.4 |  | 12,653,445 |  | (4,186,079 | ) | (156,709 | ) | 8,310,657 |
|  | As of December 31, 2017 |
|  | Weighted- Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Impairment Amount |  | Net Carrying Amount |
|  | Year |  | RMB |  | RMB |  | RMB |  | RMB |
Strategic Cooperation |  | 5.0 |  | 6,075,289 |  | (4,563,957 | ) | — |  | 1,511,332 |
Non-compete |  | 8.0 |  | 2,467,005 |  | (885,390 | ) | — |  | 1,581,615 |
Technology |  | 6.5 |  | 754,560 |  | (168,051 | ) | (69,922 | ) | 516,587 |
Domain names and trademark |  | 19.5 |  | 3,250,789 |  | (278,372 | ) | (27,124 | ) | 2,945,293 |
Others |  | 5.6 |  | 286,108 |  | (88,555 | ) | (59,663 | ) | 137,890 |
Total |  | 9.3 |  | 12,833,751 |  | (5,984,325 | ) | (156,709 | ) | 6,692,717 |
Amortization expenses for intangible assets were RMB1,449,652, RMB1,620,675 and RMB1,798,246 for the years ended December 31, 2015, 2016 and 2017, respectively. The Group recorded an impairment charge of RMB156,709, nil and nil for the years ended December 31, 2015, 2016 and 2017, respectively. Please refer to Note 8 for details. As of December 31, 2017, amortization expenses related to the intangible assets for future periods are estimated to be as follows:
|  | For the year ending December 31, |
|  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 and thereafter |
|  | RMB |  | RMB |  | RMB |  | RMB |  | RMB |  | RMB |
Amortization expenses |  | 1,823,387 |  | 903,045 |  | 599,535 |  | 595,022 |  | 439,736 |  | 2,331,992 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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