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Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets |
6 | Intangible assets, net
Intangible assets consist of the following:
|  | As of December 31, |
|  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | US$ |
Acquired computer software, systems and technology |  |  | 15,693 |  |  |  | 13,623 |  |  |  | 2,138 |
Less: Accumulated amortization |  |  | (6,174 | ) |  |  | (8,225 | ) |  |  | (1,291 | )
Total intangible assets, net |  |  | 9,519 |  |  |  | 5,398 |  |  |  | 847 |
No impairment charges were recognized on intangible assets for the years ended December 31, 2019, 2020 and 2021, respectively. The weighted average amortization period of intangible assets were 4.2 years, 3.9 years and 4.0 years for the years ended December 31, 2019, 2020 and 2021, respectively. Amortization expense of intangible assets were RMB2,307, RMB4,366 and, RMB4,481 (US$703) for the years ended December 31, 2019, 2020 and 2021, respectively. Estimated amortization expense relating to the existing intangible assets with finite lives for each of the next five years is as follows:
|  | RMB |  |  | US$ |
For the year ending December 31, 2022 |  |  | 2,782 |  |  |  | 437 |
2023 |  |  | 2,080 |  |  |  | 326 |
2024 |  |  | 522 |  |  |  | 82 |
2025 |  |  | 14 |  |  |  | 2 |
2026 |  |  | — |  |  |  | — |
There were no intangible assets with an indefinite useful life as of December 31, 2020 and 2021.

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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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