Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, plant and equipment [abstract]

Disclosure of detailed information about property, plant and equipment

The estimated useful lives of property, plant and equipment for current and comparative periods are as follows:



Building under finance lease	15 years
Computer equipment	3 to 7 years
Furniture and fixtures	5 to 14 years
Furniture and fixtures under finance lease	5 years
Leasehold improvements	The shorter of initial term of the respective lease and
	estimated useful life
Production and test equipment	4 to 15 years
Production and test equipment under finance lease	5 years



	December 31,		December 31,
Net carrying amounts	2018		2017
Building under finance lease	$	5,007	$	5,819
Computer equipment	1,639		1,020
Furniture and fixtures	67		155
Leasehold improvements	1,019		1,624
Production and test equipment	13,888		6,696
	$	21,620	$	15,314



Cost	December 31, 2017		Additions		Disposals			Effect of movements in exchange rates			December 31, 2018
Building under finance lease	$	12,180	$	—	$	—		$	—		$	12,180
Computer equipment	4,787		1,016		(215		)	(4		)	5,584
Furniture and fixtures	1,190		6		(87		)	(6		)	1,103
Leasehold improvements	8,246		71		(363		)	(18		)	7,936
Production and test equipment	36,431		8,932		(2,047		)	(6		)	43,310
	$	62,834	$	10,025	$	(2,712	)	$	(34	)	$	70,113



Accumulated depreciation and impairment loss	December 31, 2017		Depreciation		Disposals			Effect of movements in exchange rates			December 31, 2018
Building under finance lease	$	6,361	$	812	$	—		$	—		$	7,173
Computer equipment	3,767		383		(200		)	(5		)	3,945
Furniture and fixtures	1,035		60		(54		)	(5		)	1,036
Leasehold improvements	6,622		524		(211		)	(18		)	6,917
Production and test equipment	29,735		1,299		(1,607		)	(5		)	29,422
	$	47,520	$	3,078	$	(2,072	)	$	(33	)	$	48,493

During the year ended December 31, 2018, the Corporation had cash additions of $9,854,000 and non-cash additions of $171,000 related to an adjustment for asset retirement obligations (note 16).


9.	Property, plant and equipment (cont'd):



Cost	December 31, 2016		Additions		Disposals			Transfers			Effect of movements in exchange rates		December 31, 2017
Building under finance lease	$	12,180	$	—	$	—		$	—		$	—	$	12,180
Computer equipment	4,607		390		(169		)	(54		)	13		4,787
Furniture and fixtures	1,163		32		(17		)	—			12		1,190
Leasehold improvements	8,794		7		(594		)	—			39		8,246
Production and test equipment	33,053		2,639		(809		)	1,532			16		36,431
Production and test equipment	2,078		—		—			(2,078		)	—		—
under finance lease
	$	61,875	$	3,068	$	(1,589	)	$	(600	)	$	80	$	62,834



Accumulated depreciation and impairment loss	December 31, 2016		Depreciation		Impairment loss		Disposals			Transfers			Effect of movements in exchange rates		December 31, 2017
Building under finance lease	$	5,549	$	812	$	—	$	—		$	—		$	—	$	6,361
Computer equipment	3,558		365		—		(169		)	—			13		3,767
Furniture and fixtures	978		62		—		(17		)	—			12		1,035
Leasehold improvements	6,606		566		—		(594		)	—			44		6,622
Production and test equipment	28,040		1,366		284		(809		)	843			11		29,735
Production and test equipment	1,443		—		—		—			(1,443		)	—		—
under finance lease
	$	46,174	$	3,171	$	284	$	(1,589	)	$	(600	)	$	80	$	47,520