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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
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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

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- 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 + Details
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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). + 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 + Details
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- Definition 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition share-based compensation arrangement by share-based payment award, equity instruments other than options, earned but unissued, weighted average grant date fair value. + References No definition available. + Details
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