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ACQUIRED INTANGIBLE ASSETS, NET | 12 Months Ended
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Dec. 31, 2018
ACQUIRED INTANGIBLE ASSETS, NET |
ACQUIRED INTANGIBLE ASSETS, NET | 10. ACQUIRED INTANGIBLE ASSETS, NET Intangible assets, net, consisted of the following:
|  | As of December 31,
|  | 2017 |  | 2018
Trademark |  | — |  | 1,367
Student base |  | — |  | 3,632
Total costs |  | — |  | 4,999
Less: accumulated amortization |  | — |  | (508)
Intangible assets, net |  | — |  | 4,491
Amortization expenses for acquired intangible assets for the years ended December 31, 2016, 2017 and 2018 were nil, nil and $529, respectively. As of December 31, 2018, the estimated amortization expenses related to intangible assets for next five years is expected to be $1,133, $1,133, $1,133, $714 and $208 respectively, and $170 thereafter.

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