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Share Based Compensation Plan - Summary of Performance base restricted share unit activity (Detail) - Performance-Based Restricted Share Unit [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Performance-based Restricted Share Units, Beginning balance	1,056,666	128,000
Number of Performance-based Restricted Share Units, Granted	355,000	979,000
Number of Performance-based Restricted Share Units, Exercised	(442,666)	(50,334)	(768,000)
Number of Performance-based Restricted Share Units, Forfeited/expired	(230,000)		(10,000)
Number of Performance-based Restricted Share Units, Forfeited		0
Number of Performance-based Restricted Share Units, Ending balance	739,000	1,056,666	128,000
Number of Performance-based Restricted Share Units,Earned but unissued	30,000	175,333	0
Weighted Average Grant Date Fair Value, Beginning balance	$ 5.56	$ 2.82
Weighted Average Grant Date Fair Value, Granted	14.94	5.79
Weighted Average Grant Date Fair Value, Excerised	7.82	3.06	2.20
Weighted Average Grant Date Fair Value, Forfeited/expired	12.90		2.20
Weighted Average Grant Date Fair Value, Forfeited		0
Weighted Average Grant Date Fair Value, Ending balance	6.58	5.56	2.82
Weighted Average Grant Date Fair Value, Earned but unissued	$ 12.87	$ 5.08	$ 0
Exercise price in CA$2.20
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Performance-based Restricted Share Units, Granted			885,000
Weighted Average Grant Date Fair Value, Granted			$ 2.20
Exercise price in CA$6.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Performance-based Restricted Share Units, Granted			21,000
Weighted Average Grant Date Fair Value, Granted			$ 6.00

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-SubTopic 10
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-Subparagraph (c)(2)(iii)(1)
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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-Topic 718
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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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