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PROPERTY, PLANT AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, NET
10.
PROPERTY, PLANT AND EQUIPMENT, NET
 
Property, plant and equipment consist of the following:
 
 
 
As at December 31,
 
 
 
2017
 
 
2018
 
 
2018
 
 
 
RMB
 
 
RMB
 
 
US$
 
Buildings
 
 
230,273
 
 
 
254,577
 
 
 
37,027
 
Medical equipment
 
 
668,169
 
 
 
404,050
 
 
 
58,767
 
Electronic and office equipment
 
 
16,864
 
 
 
19,564
 
 
 
2,845
 
Motor vehicles
 
 
2,361
 
 
 
2,993
 
 
 
435
 
Leasehold improvement and building improvements
 
 
14,771
 
 
 
14,050
 
 
 
2,043
 
Construction in progress
 
 
329,259
 
 
 
823,361
 
 
 
119,753
 
Total
 
 
1,261,697
 
 
 
1,518,595
 
 
 
220,870
 
Less: accumulated depreciation
 
 
(407,964
)
 
 
(275,627
)
 
 
(40,088
)
Impairment charges
 
 
(60,162
)
 
 
(23,659
)
 
 
(3,441
)
 
 
 
793,571
 
 
 
1,219,309
 
 
 
177,341
 
 
Depreciation expenses were RMB117,051, RMB83,224 and RMB40,855 (US$5,942) for the years ended December 31, 2016, 2017 and 2018, respectively. Impairment loss of RMB47,827, RMB21,476 and RMB4,418 (US$643)
were recognized for network operating segment and impairment loss of nil, nil and RMB351 (US$51) for hospital operating segment for the years ended December 31, 2016, 2017 and 2018, 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, 2016, 2017 and 2018, RMB4,360, RMB27,906 and RMB41,272 (US$6,003)
impairment was written off for network operating segment upon the disposal of medical equipment.
  
As at December31, 2017 and 2018, certain of the Group's property, plant and equipment with a total net book value of RMB37,481 and nil were pledged as collaterals for bank borrowings of RMB29,725 and nil, respectively (note17).
 
As at December 31, 2017 and 2018, certain of the Group's construction in progress with a total net book value of RMB206,244 and RMB633,444 (US$92,131) were pledged to secure bank and other borrowings of RMB280,459 and RMB501,789 (US$72,982), respectively (note17) and mandatorily redeemable noncontrolling interest of RMB396,281
and RMB434,216 (US$63,154) (note1), respectively.
 
As at December 31, 2017 and 2018, the Group held equipment under operating lease contracts with customers with an original cost of RMB519,426 and RMB205,279
(US$29,857) and accumulated depreciation of RMB312,853 and RMB133,130 (US$
 
19,363), respectively.