Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, plant and equipment

Reconciliation of property, plant and equipment

	Furniture
	and		Leasehold		TMS
	equipment		improvements		devices		Total
Cost
Balance, December 31, 2018	$	203,318	$	3,704	$	1,000,426	$	1,207,448
Additions		—		179,399		847,883		1,027,282
Asset disposal		(27,902)		—		(55,325)		(83,227)
Balance, December 31, 2019		175,416		183,103		1,792,984		2,151,503
Additions		—		—		383,200		383,200
Asset disposal		—		—		(50,093)		(50,093)
Balance, December 31, 2020	$	175,416	$	183,103	$	2,126,091	$	2,484,610
Accumulated depreciation
Balance, December 31, 2018	$	54,685	$	604	$	240,693	$	295,982
Depreciation		28,723		4,687		157,184		190,594
Asset disposal		—		—		(1,404)		(1,404)
Balance, December 31, 2019		83,408		5,291		396,473		485,172
Depreciation		28,768		25,593		258,154		312,515
Asset disposal		—		—		(4,413)		(4,413)
Balance, December 31, 2020	$	112,176	$	30,884	$	650,214	$	793,274
Net book value
Balance, December 31, 2019	$	92,008	$	177,812	$	1,396,511	$	1,666,331
Balance, December 31, 2020		63,240		152,219		1,475,877		1,691,336