	Land			Buildings			Building improvement			Machinery and equipment			Motor vehicle and other asset and assets under finance lease			Office equipment			Construction in progress			Total
	US$’000			US$’000			US$’000			US$’000			US$’000			US$’000			US$’000			US$’000
Cost
At January 1, 2017		4,449			44,235			4,861			88,897			4,608			6,227			2,070			155,347
Additions		1,120			34			19			400			1,119			396			1,845			4,933
Disposals		—			—			—			(4,392	)		(914	)		(213	)	—				(5,519	)
Transfer	—			—				292			2,600			—			124			(3,016	)		—
Exchange differences		658			4,152			450			9,459			417			425			148			15,709
At December 31, 2017		6,227			48,421			5,622			96,964			5,230			6,959			1,047			170,470

Additions		—			229			76			480			624			395			2,694			4,498
Disposals		—			(8	)		—			(1,120	)		(503	)		(490	)		—			(2,121	)
Transfer		—			—			3			1,418			505			102			(2,028	)		—
Exchange differences		(21	)		(752	)		14			(1,024	)		(76	)		(244	)		(40	)		(2,143	)
At December 31, 2018		6,206			47,890			5,715			96,718			5,780			6,722			1,673			170,704

	Land			Buildings			Building improvement			Machinery and equipment			Motor vehicle and other asset and assets under finance lease			Office equipment			Construction in progress			Total
Depreciation/Impairment
At January 1, 2017		—			(28,612	)		(2,731	)		(75,482	)		(3,522	)		(5,363	)		—			(115,710	)
Depreciation charge for the year		—			(1,356	)		(254	)		(2,513	)		(477	)		(337	)		—			(4,937	)
Impairment		—		—			—				(217	)		—			(6	)		—			(223	)
Depreciation on disposals		—		—			—				4,024			877			207			—			5,108
Exchange differences		—			(3,114	)		(269	)		(8,302	)		(308	)		(389	)		—			(12,382	)
At December 31, 2017		—			(33,082	)		(3,254	)		(82,490	)		(3,430	)		(5,888	)		—			(128,144	)

Depreciation charge for the year		—			(1,164	)		(296	)		(2,435	)		(604	)		(402	)		—			(4,901	)
Impairment		—			—			—			(10	)		—			(1	)		—			(11	)
Depreciation on disposals		—			6			—			1,119			503			486			—			2,114
Transfer		—			—			—			(46	)		—			46			—			—
Exchange differences		—			510			(17	)		914			49			200			—			1,656
At December 31, 2018		—			(33,730	)		(3,567	)		(82,948	)		(3,482	)		(5,559	)		—			(129,286	)

	Land			Buildings			Building improvement			Machinery and equipment			Motor vehicle and other asset and assets under finance lease			Office equipment			Construction in progress			Total
Net book value
At December 31, 2018		6,206			14,160			2,148			13,770			2,298			1,163			1,673			41,418
At December 31, 2017		6,227			15,339			2,368			14,474			1,800			1,071			1,047			42,326
At January 1, 2017		4,449			15,623			2,130			13,415			1,086			864			2,070			39,637

In 2018, 2017 and 2016 the Company recorded an impairment loss of $11, $223 and $2,524 on property, plant and equipment at Ningbo Pacific and SFO facilities.

The Company determined to dispose building, land use rights and machinery at Ningbo Pacific due to lack of profitability. The Company has entered into an agreement to sell building and land use rights, the assets has classified as held for sale as of December 31, 2016. See the Note 7(a). The Company performed a valuation for utilized machinery measured at fair value less costs to sell using a cost approach. Its fair value measurement was classified as Level 3 of the fair value hierarchy. After considering the relevant evidence, the key assumption used included replacement costs, residual value and remaining useful life of these existing assets. The impairment test revealed that the recoverable amount was lower than the carrying amount, the Company recognized an impairment of $1,131 in other operating expenses accordingly in 2016. In 2017, the company provided an impairment loss of $223 because there are no future plans for the remaining machinery and equipment. The impairment is presented within the impairment of property, plant and equipment of North Asia segment in Note 5.

In 2016, SFO has not been able to make a profit due to Thailand's political situation and change in market demand, the Company considered this situation had an indication of possible impairment and performed an impairment test on the CGU composed of property, plant and equipment used in the manufacturing of fiber optic cables. The Company determined the recoverable amount of the CGU to be $0 based on the value in use. The key assumptions used in calculating the value in use included the revenue growth and a discount rate of 14.8%; as a result, the Company recognized an impairment of $1,393 in other operating expenses. The impairment is presented within the impairment of property, plant and equipment of Thailand segment in Note 5.

The carrying value of motor vehicles under financial leases as of December 31, 2018, 2017 and 2016 were $66, $50 and $71, respectively. These assets under financial lease are pledged for financial lease liabilities (Note 25(b)).

Information about the property, plant and equipment that were pledged to others as collaterals is provided in Note 27(e) (i).