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Taxation - Summary of Net Operating Loss Carryforwards (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Net operating tax loss carryforwards [Line Items] |  |
Net operating tax loss carryforwards | $ 10,314 | [1]
2018 [Member] |  |
Net operating tax loss carryforwards [Line Items] |  |
Net operating tax loss carryforwards | 5,721 |
2019 [Member] |  |
Net operating tax loss carryforwards [Line Items] |  |
Net operating tax loss carryforwards | 3,389 |
2020 [Member] |  |
Net operating tax loss carryforwards [Line Items] |  |
Net operating tax loss carryforwards | 555 |
2021 [Member] |  |
Net operating tax loss carryforwards [Line Items] |  |
Net operating tax loss carryforwards | 75 |
2022 and thereafter [Member] |  |
Net operating tax loss carryforwards [Line Items] |  |
Net operating tax loss carryforwards | $ 574 |
[1] | As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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