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Goodwill and intangible assets (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets And Goodwill [Abstract]

Reconciliation of carrying amount of goodwill and intangibles

At December 31, 2018


						Intellectual
		Goodwill		Contracts		property		Patents		Total


Cost
Beginning of year	$	111,399	$	109,812	$	118,819	$	10,966	$	350,996
Effect of movements in exchange rates		-		9,559		-		-		9,559

End of year		111,399		119,371		118,819		10,966		360,555


Accumulated amortization and impairment
Beginning of year		111,399		104,939		53,680		10,966		280,984
Amortization charge		-		1,325		3,474		-		4,799
Effect of movements in exchange rates		-		9,170		-		-		9,170

End of year		111,399		115,434		57,154		10,966		294,953


Net book value at December 31, 2018	$	-	$	3,937	$	61,665	$	-	$	65,602

At December 31, 2017


						Intellectual
		Goodwill		Contracts		property		Patents		Total


Cost
Beginning of year	$	118,664	$	117,533	$	118,819	$	11,737	$	366,753
Effect of movements in exchange rates		(7,265)		(7,721)		-		(771)		(15,757)

End of year		111,399		109,812		118,819		10,966		350,996


Accumulated amortization and impairment
Beginning of year		-		110,284		49,589		3,570		163,443
Amortization charge		-		2,002		4,091		630		6,723
Impairment charge		111,399		-		-		7,150		118,549
Effect of movements in exchange rates		-		(7,347)		-		(384)		(7,731)

End of year		111,399		104,939		53,680		10,966		280,984


Net book value at December 31, 2017	$	-	$	4,873	$	65,139	$	-	$	70,012