	2019			2018
	US$’000			US$’000
At January 1		1,657			3,456
Charge for the year		72			726
Write-off		(1	)		(2,292	)
Unused amounts reversed		(194	)		(156	)
Currency translation adjustment		19			(74	)
Reclassification		(3	)		(3	)
At December 31		1,550			1,657

The Company recorded a loss allowance on trade receivables amounted to $2.0 million, for a specific customer of a subsidiary, as of December 31, 2017. This loss allowance on trade receivables was written off in 2018 based on the court judgement with no reasonable expectation of recovery.

					Past due
	Total		Current		1-30 days		31-60 days		61-90 days		91-120 days		>120 days
	US$’000		US$’000		US$’000		US$’000		US$’000		US$’000		US$’000
December 31, 2019
Expected loss rate	2.05%		0.14%		0.76%		3.75%		9.52%		23.89%		75.97%
Gross carrying amount - trade receivables		75,627		59,867		9,979		3,759		294		180		1,548
Loss allowances		1,550		86		76		141		28		43		1,176
Trade receivable, net		74,077		59,781		9,903		3,618		266		137		372

December 31, 2018
Expected loss rate	2.04%		0.07%		0.86%		3.95%		20.18%		31.71%		64.70%
Gross carrying amount - trade receivables		81,274		67,318		9,183		2,276		327		82		2,088
Loss allowances		1,657		45		79		90		66		26		1,351
Trade receivable, net		79,617		67,273		9,104		2,186		261		56		737

The Company applies the IFRS 9 simplified approach to measuring expected credit losses which uses a lifetime expected loss allowance for trade receivables. To measure the expected credit losses, trade receivables have been grouped based on shared credit risk characteristics and the days past due. The expected loss rates are based on the Company’s historical credit loss experience, adjusted to reflect current and forward-looking information on general economic conditions affecting the ability of the customers to settle the receivables.

The impairment of trade receivables was assessed based on the incurred loss model as of December 31, 2017. The Company measured estimated impairment losses on trade receivables based on the inability of its customers to make required payments. The Company considered the following factors when determining the collectability of specific customer accounts: customer credit-worthiness, customer financial condition, past transaction history with the customer, current economic industry trends, and changes in customer payment terms.

The Company obtained collateral in respect of doubtful receivables from customers. The collateral takes the form of a lien over the customer’s assets and gives the Company a claim on these assets for the doubtful receivables.

In March 2017, a lawsuit was filed by a debtor to rescind the foreclosure that the Company has undertaken on the collateral in Thailand. The Company’s foreclosure prevailed according to the judgement from the Appeal Court on November 28, 2017. The debtor’s petition reached to the Supreme Court on June 19, 2018, and was denied on March 27, 2019. The Company performed a valuation to determine the fair value of the collateral. As of December 31, 2019 and 2018, the fair value of the collateral was $1,339 and $1,200, respectively, which was lower than the amount of the associated delinquent account, and the Company recognized an impairment loss of $30 and $52 in other operating expenses, respectively.

See Note 27(b) credit risk of trade receivables for discussions on how the Company manages and measures credit quality of trade receivables that are neither past due nor impaired.

The carrying amounts of other receivables pledged as collateral against credit facilities received from financial institutions are disclosed in Note 27(e)(ii).