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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2019
PROPERTY, PLANT AND EQUIPMENT, NET |
PROPERTY, PLANT AND EQUIPMENT, NET | 10. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment consist of the following:
|  | As at December 31,
|  | 2018 |  | 2019 |  | 2019
|  | RMB |  | RMB |  | US$
Buildings |  | 254,577 |  | 277,569 |  | 39,870
Medical equipment |  | 404,050 |  | 458,843 |  | 65,909
Electronic and office equipment |  | 19,564 |  | 20,983 |  | 3,014
Motor vehicles |  | 2,993 |  | 2,993 |  | 430
Leasehold improvement and building improvements |  | 14,050 |  | 80,922 |  | 11,624
Construction in progress |  | 823,361 |  | 1,390,495 |  | 199,732
Total |  | 1,518,595 |  | 2,231,805 |  | 320,579
Less: accumulated depreciation |  | (275,627) |  | (314,151) |  | (45,125)
Impairment charges |  | (23,659) |  | (18,793) |  | (2,700)
|  | 1,219,309 |  | 1,898,861 |  | 272,754
Depreciation expenses were RMB83,224, RMB40,855 and RMB44,358 (US$6,372) for the years ended December 31, 2017, 2018 and 2019, respectively. Impairment loss of RMB21,476, RMB4,418 and RMB6,453 (USD$927) were recognized for network operating segment and impairment loss of nil, RMB351 and nil for hospital operating segment for the years ended December 31, 2017, 2018 and 2019, respectively. Impairment charges mainly include impairment provided for medical equipment in several low performance centers as well as idle assets. For the years ended December 31, 2017, 2018 and 2019, impairment of RMB27,906, RMB41,272 and RMB10,968(US$1,575) was written off for network operating segment upon the disposal of medical equipment and construction project. Impairment of nil, nil and RMB353 (US$51) 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 RMB205,279 and RMB271,603 (US$39,013) and accumulated depreciation of RMB133,130 and RMB150,988 (US$ 21,688), as of December 31, 2018 and 2019, respectively. The total net book value of the Group's property, plant and equipment pledged as collateral for other borrowings as of December 31, 2018 and 2019 was nil and RMB119,359 (US$17,145), respectively. The total net book value of the Group's construction in progress pledged to secure bank and other borrowings as of December 31, 2018 and 2019 was RMB633,444 and RMB1,152,379(US$165,529), respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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