Shareholders’ equity (deficit) (Tables)

12 Months Ended

Dec. 31, 2019

Shareholders’ equity (deficit)

Schedule of additional paid-in capital

	2019		2018
Opening balance	$	2,655	$	2,372
Share-based compensation expense		1,191		633
Exercise of stock options		(41)		(350)
Closing balance	$	3,805	$	2,655

Schedule of outstanding and exercisable options

	2019							2018
		Number				Weighted		Number	Weighted
		of shares				average		of shares	average
						exercise			exercise
		2019 Plan		2011 Plan	Total	price		2011 Plan	price
Outstanding at beginning of period		—		2,295,045	2,295,045	$	1.771	968,782	$	1.133
Granted - 2011 Plan		—		116,742	116,742		9.417	1,695,258		2.037
Granted - 2019 Plan		287,138		—	287,138		19.948	—		—
Exercised - 2011		—		(33,162)	(33,162)		1.326	(356,797)		1.287
Forfeited - 2011		—		(14,099)	(14,099)		2.660	(12,198)		1.096
Forfeited - 2019		(66,998)		—	(66,998)		17.224	—		—
Outstanding - 12/31/2019		220,140		2,364,526	2,584,666	$	3.755	2,295,045	$	1.771
Outstanding - 12/31/2019 - Weighted average exercise price	$	20.777	$	2.151
Exercisable at end of period		1,165		1,212,226	1,213,391	$	1.652	588,817	$	1.314
Exercisable at end of period - Weighted average exercise price	$	17.780	$	1.637

Schedule of non-vested share options activity

	2019							2018
		Number				Weighted		Number	Weighted
		of options				average		of options	average
		2019 Plan		2011 Plan	Total	fair value		2011 Plan	fair value
Non-vested share options at beginning of period		—		1,706,303	1,706,303	$	1.346	451,113	$	1.027
Granted - 2011 Plan		—		116,742	116,742		6.649	1,695,258		1.463
Granted - 2019 Plan		287,138		—	287,138		13.912	—		—
Vested, outstanding		—		(656,646)	(656,646)		1.333	(427,870)		1.479
Vested, outstanding		(1,165)		—	(1,165)		12.160	—		—
Forfeited - 2011		—		(14,099)	(14,099)		1.906	(12,198)		1.064
Forfeited - 2019		(66,998)		—	(66,998)		12.221	—		—
Non-vested share options at end of period		218,975		1,152,300	1,371,275	$	3.889	1,706,303	$	1.346
Non-vested share options at end of period - Weighted average fair value	$	14.439	$	1.884

Schedule of share option outstanding

The following table summarizes information with respect to share options outstanding as of December 31, 2019:

	Options outstanding				Options exercisable
		Weighted				Weighted
		average	Weighted			average	Weighted
		remaining	average			remaining	average
	Number	contractual	exercise		Number	contractual	exercise
Exercise price	of options	life (years)	price		of options	life (years)	price
C$0.96	235,497	3.3	$	0.914	235,497	3.3	$	0.914
$1.12	261,913	6.3	$	1.117	207,319	6.2	$	1.117
$1.54	956,688	7.9	$	1.543	429,175	7.9	$	1.543
$1.91	82,772	8.6	$	1.915	40,122	9	$	2
$2.66	710,914	8.9	$	2.660	300,113	8.9	$	2.660
$9.42	116,742	9.2	$	9.415	—	—	$	—
$15.87	23,620	9.6	$	15.870	—	—	$	—
$17.78	42,000	9.9	$	17.780	1,165	9.9	$	17.780
$19.14	3,760	9.8	$	19.140	—	—	$	—
$21.28	3,760	9.7	$	21.280	—	—	$	—
$22.45	147,000	9.7	$	22.450	—	—	$	—
Total	2,584,666	7.8	$	3.755	1,213,391	7.0	$	1.652

Schedule of weighted average assumptions for the options granted

The fair value of options granted was estimated using the Black‑Scholes option pricing model, resulting in the following weighted average assumptions for the options granted for the years ended December 31, 2019 and 2018:

	2019			2018
Exercise price	$	16.900		$	2.037
Share price	$	16.900		$	2.037
Volatility		80	%		82	%
Risk-free interest rate		1.92	%		2.84	%
Expected life		6.21 years			6.25 years
Dividend		0	%		0	%

Schedule of share-based compensation expense

The Company recognized share‑based compensation expense as follows at December 31, 2019 and 2018:

	2019		2018
Administration	$	574	$	209
Research and development		495		371
Commercial activities		122		53
	$	1,191	$	633