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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of estimated useful lives |
| Buildings |  | 20 years
| Leasehold improvements |  | Shorter of the lease term and the estimated useful lives of the assets
| Motor vehicles |  | 5 years
| Equipment, fixture and furniture, and other fixed assets |  | 2 - 10 years
Schedule of Amortization of finite-lived intangible assets |
| Trademark |  | 10 years
| Backlog |  | 3 years
| Customer relationship |  | 5.5 years
| Reacquired right |  | 1 year
Schedule of summarizes the effect on the consolidated balance sheet |
|  | December 31, 2018 As previously reported |  |  | Effect of the adoption of ASC 842 |  |  | January 1, 2019 As adjusted |
Current portions: |  |  |  |  |  |  |  |  |
Prepayment and other current assets |  |  | 104,761 |  |  |  | (10,612 | ) |  |  | 94,149 |
Current operating lease liabilities |  |  | - |  |  |  | 99,706 |  |  |  | 99,706 |
Non-current portions： |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  | - |  |  |  | 397,490 |  |  |  | 397,490 |
Intangible assets, net |  |  | 36,904 |  |  |  | (6,305 | ) |  |  | 30,599 |
Operating lease liabilities |  |  | - |  |  |  | 280,867 |  |  |  | 280,867 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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