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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2020
PROPERTY, PLANT AND EQUIPMENT, NET  
PROPERTY, PLANT AND EQUIPMENT, NET

9.   PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment consist of the following:

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As at December 31, 

​

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2019

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2020

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2020

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RMB

    

RMB

    

US$

Buildings

 

277,569

 

16,801

 

2,575

Medical equipment

 

458,843

 

368,609

 

56,492

Electronic and office equipment

 

20,983

 

16,409

 

2,515

Motor vehicles

 

2,993

 

3,713

 

569

Leasehold improvement and building improvements

 

80,922

 

76,114

 

11,665

Construction in progress

 

1,390,495

 

2,320,686

​

355,661

Total

 

2,231,805

 

2,802,332

​

429,477

Less: accumulated depreciation

 

(314,151)

 

(224,348)

 

(34,383)

Impairment charges

 

(18,793)

 

(18,793)

 

(2,881)

​

 

1,898,861

 

2,559,191

​

392,213

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Depreciation expenses were RMB40,855, RMB44,358 and RMB55,030 (US$8,434) for the years ended December 31, 2018, 2019 and 2020, respectively. Impairment loss of RMB4,418, RMB6,453 and nil were recognized for network operating segment and impairment loss of RMB351, nil and nil for hospital operating segment for the years ended December 31, 2018, 2019 and 2020 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, 2018, 2019 and 2020, impairment of RMB41,272, RMB10,968 and RMB nil was written off for network operating segment upon the disposal of medical equipment and construction project. Impairment of nil, RMB353 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 RMB271,603 and RMB168,876 (US$25,881) and accumulated depreciation of RMB150,988 and 127,558 (US$19,549), as of December 31, 2019 and 2020, respectively.

The total net book value of the Group's property, plant and equipment pledged as collateral for other borrowings as of December 31, 2019 and 2020 was RMB119,359 and RMB414,326 (US$63,498) (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, 2019 and 2020 was RMB 1,152,379 and RMB 1,150,018(US$ 176,248) (note 18), respectively.