16.	TRADE AND OTHER RECEIVABLES

	December 31, 2022 US$‘000		December 31, 2021 US$‘000
Trade receivables, net of impairment losses		12,620		13,290
Prepayments		1,932		1,945
Contract assets		739		739
Value added tax		43		-
Finance lease receivables		86		142
Grant receivable		333		-

		15,753		16,116

Trade receivables are shown net of an impairment losses provision of US$2,691,000 (2021: US$2,986,000) (2020: US$3,922,000) (see Note 26). Prepayments are shown after impairment charges of US$482,000 (2021: US$583,000) (2020: US$562,000) (see Note 5).

Long-term contract receivable

(i) Finance lease commitments – Group as lessor

The Group leases instruments as part of its business. Future minimum receivables with non-cancellable terms are as follows:

	December 31, 2022 US$‘000
	Gross investment		Unearned income		Minimum payments receivable
Less than one year		180		6		86
Between one and five years (Note 14)		173		6		84

		353		12		170

	December 31, 2021 US$‘000
	Gross investment		Unearned income		Minimum payments receivable
Less than one year		292		11		142
Between one and five years (Note 14)		310		11		151

		602		22		293

The Group classified future minimum lease receivables between one and five years of US$84,000 (2021: US$151,000) as Other Assets, see Note 14. Under the terms of the lease arrangements, no contingent rents are receivable.

(ii) Operating lease commitments – Group as lessor

The Group leases instruments under operating leases as part of its business.

Future minimum rentals receivable under non-cancellable operating leases are as follows:

	December 31, 2022 US$‘000
	Instruments		Total
Less than one year		1,589		1,589

		1,589		1,589

(ii) Operating lease commitments – Group as lessor

	December 31, 2021 US$‘000
	Instruments		Total
Less than one year		3,953		3,953
Between one and five years		171		171

		4,124		4,124