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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2021
INCOME TAXES |
Summary of income (loss) before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
PRC including Hong Kong and Taiwan | ​ | 2,334 | ​ | (392) | ​ | 617
Germany |  | — |  | (1,606) |  | (632)
Other |  | 231 |  | (281) |  | (393)
Total |  | 2,565 |  | (2,279) |  | (408)
Schedule of tax expense (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
Current Tax |  | 678 |  | 338 |  | 555
Deferred Tax |  | (38) |  | (553) |  | (543)
Total |  | 640 |  | (215) |  | 12
Schedule of a reconciliation between the effective income tax rate and PRC statutory income tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, | ​
​ |  | 2019 |  | 2020 |  | 2021 | ​
PRC statutory tax rate |  | 25 | % | 25 | % | 25 | %
Tax effect of non-deductible expenses and non-taxable income in determining taxable profit |  | (3) | % | (6) | % | (6) | %
Effect of different tax rate of group entities operating in other jurisdictions |  | 1 | % | (2) | % | (6) | %
Effect of change in valuation allowance |  | 2 | % | (10) | % | (24) | %
Effect of tax holiday |  | (2) | % | 1 | % | 9 | %
Effect of cash dividends |  | 4 | % | 0 | % | (8) | %
Effect of excess tax benefit of share-based rewards |  | (2) | % | 1 | % | 7 | %
Effective tax rate |  | 25 | % | 9 | % | (3) | %
Schedule of the aggregate amount and per share effect of the tax holidays | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
Aggregate amount |  | 45 |  | 31 |  | 37
Per share effect—basic |  | 0.02 |  | 0.01 |  | 0.01
Per share effect—diluted |  | 0.01 |  | 0.01 |  | 0.01
Schedule of the principal components of the Group's deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2020 |  | 2021
Deferred tax assets: |  |  |  |
Net loss carryforward |  | 888 |  | 1,271
Deferred revenue |  | 283 |  | 326
Long-term assets |  | 388 |  | 238
Bad debt provision |  | 18 |  | 40
Accrued payroll |  | 69 |  | 45
Other accrued expenses |  | 3 |  | 3
Share-based compensation |  | 31 |  | 29
Others |  | 12 |  | 150
Valuation allowance |  | (369) |  | (466)
Total deferred tax assets, net of valuation allowance |  | 1,323 |  | 1,636
Deferred tax liabilities: |  | ​ |  | ​
Fair value adjustment for Building, land use rights and identified intangible assets due to acquisition |  | 1,782 |  | 1,596
Others |  | 99 |  | 31
Total deferred tax liabilities | ​ | 1,881 |  | 1,627
Net deferred tax (liabilities) assets | ​ | (558) | ​ | 9
Analysis as: | ​ | ​ | ​ | ​
Deferred tax assets | ​ | 623 | ​ | 862
Deferred tax liabilities | ​ | 1,181 | ​ | 853
Net deferred tax (liabilities) assets |  | (558) | ​ | 9
Summary of movement of the valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
Balance at the beginning of the year | ​ | (107) | ​ | (152) | ​ | (369)
Provided |  | (79) |  | (249) |  | (151)
Reversed |  | 24 |  | 32 |  | 37
Written off |  | 10 |  | — |  | 17
Balance at the end of the year |  | (152) |  | (369) |  | (466)
Schedule of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
Balance at January 1 |  | 14 |  | 18 |  | 50
Addition for tax positions |  | 4 |  | 32 |  | 10
Balance at December 31 |  | 18 |  | 50 |  | 60

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