Share Capital - Summary of Stock Option Activity (Detail)	12 Months Ended
	Dec. 31, 2019 $ / shares shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2018 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of options, Beginning balance	1,344,687	1,344,687	1,344,687	1,344,687
Issued	500,000	500,000	0	0
Exercised	(840,000)	(840,000)
Number of options, Ending balance	1,004,687	1,004,687	1,344,687	1,344,687
Weighted average exercise price, Beginning balance | (per share)	$ 0.53	$ 0.69	$ 0.55	$ 0.69
Weighted average exercise price, Issued | (per share)	2.73	3.56
Weighted average exercise price, Exercised | (per share)	(0.52)	(0.68)
Weighted average exercise price, Ending balance | (per share)	$ 1.63	$ 2.12	$ 0.53	$ 0.69