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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT, NET. |
PROPERTY, PLANT AND EQUIPMENT, NET | 9. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2020 | ​ | 2021 | ​ | 2021
​ |  | RMB |  | RMB |  | US$
Buildings |  | 16,801 |  | 775,708 |  | 121,726
Medical equipment |  | 368,609 |  | 484,653 |  | 76,053
Electronic and office equipment |  | 16,409 |  | 57,215 |  | 8,978
Motor vehicles |  | 3,713 |  | 3,718 |  | 583
Leasehold improvement and building improvements |  | 76,114 |  | 78,724 |  | 12,354
Construction in progress |  | 2,320,686 |  | 1,986,032 | ​ | 311,651
Total |  | 2,802,332 |  | 3,386,050 | ​ | 531,345
Less: accumulated depreciation |  | (224,348) |  | (224,877) |  | (35,288)
Impairment charges |  | (18,793) |  | (16,148) |  | (2,534)
​ |  | 2,559,191 |  | 3,145,025 | ​ | 493,523
​ Depreciation expenses were RMB44,358, RMB55,030 and RMB64,288 (US$10,088) for the years ended December 31, 2019, 2020 and 2021, respectively. Impairment loss of RMB6,453, nil and nil were recognized for network operating segment and impairment loss of nil, nil and nil for hospital operating segment for the years ended December 31, 2019, 2020 and 2021 respectively. Impairment charges mainly include impairment provided for medical equipment in several low performance network centers as well as idle assets. For the years ended December 31, 2019, 2020 and 2021, impairment of RMB10,968, nil and RMB 2,645 (US$415) was written off for network operating segment upon the disposal of medical equipment and construction project. Impairment of RMB353, nil and nil was written off for hospital operating segment upon the termination of construction project. The Group held equipment under operating lease contracts with customers with an original cost of RMB168,876 and RMB105,980 (US$16,631) and accumulated depreciation of RMB127,558 and RMB78,247 (US$12,279), as of December 31, 2020 and 2021, respectively. The total net book value of the Group’s property, plant and equipment pledged as collateral for other borrowings as of December 31, 2020 and 2021 was RMB414,326 and RMB361,806 (US$56,775) (note 18), respectively. The total net book value of the Group’s construction in progress pledged to secure bank and other borrowings as of December 31, 2020 and 2021 was RMB 1,150,018 and RMB 1,709,761 (US$ 268,299) (note 18), respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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