SUPPLEMENTAL FINANCIAL INFORMATION

The components of revenues are as follows:

The Company had four major customers to which its sales for the year were as follows: 2019 - $2.72 million; $0.77 million; $0.75 million, $0.74 million; (2018 (three major customers) - $24.52 million; $5.03 million; $1.24 million); (2017 (three major customers) - $13.08 million; $6.99 million; $4.40 million).

The Company’s revenues by country of customer for the current year were as follows: 2019 - $5.80 million - U.S.; $0.07 million - Other; (2018 - $25.76 million - U.S.; $5.03 million - Other) (2017 - $20.07 million - U.S.; $4.40 million - Other).

The Company did not have any deferred revenue at December 31, 2019. As of December 31, 2018, $2.72 million relates to proceeds received on toll materials in advance of required activity.

The components of other income (loss) are as follows:



	Years ended December 31,
	2019			2018			2017
Interest income	$	482		$	336		$	161
Change in value of investments accounted for at fair value	(153		)	769			509
Change in value of warrant liabilities	3,726			(3,469		)	784
Change in value of Convertible Debentures	291			(612		)	(940		)
Gain on assets held for sale	—			341			—
Foreign exchange loss	(46		)	—			—
Sale of surplus assets	—			293			1,913
Other	(322		)	14			142
Other income (loss)	$	3,978		$	(2,328	)	$	2,569

The components of accounts payable and accrued liabilities are as follows:



	December 31, 2019		December 31, 2018
Accounts payable	$	2,033	$	1,881
Payroll liabilities	1,588		1,928
Other accrued liabilities	1,817		4,112
Accounts payable and accrued liabilities	$	5,438	$	7,921