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GOODWILL | 12 Months Ended
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Dec. 31, 2018
GOODWILL |
GOODWILL | 9. GOODWILL The Group has five reporting units where they carry goodwill resulting from the acquisitions. The changes in carrying amount of goodwill for the years ended December 31, 2017 and 2018 were as follows.
|  | As of December 31,
|  | 2017 |  | 2018
Costs: |  |  |  |
Beginning balance |  | 401 |  | 428
Addition (Note 3) |  | — |  | 25,035
Foreign currency adjustment |  | 27 |  | (367)
Ending balance |  | 428 |  | 25,096
Goodwill impairment loss |  | — |  | —
Goodwill, net |  | 428 |  | 25,096
Goodwill is tested for impairment annually or more frequently if events or changes in circumstances indicate that it might be impaired. The Group performed the annual impairment test at year end and did not record any impairment of goodwill for the years ended December 31, 2016, 2017 and 2018.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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