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Income Taxes - Summary of Valuation Allowance (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Deferred Tax Assets Net Of Valuation Allowance [Abstract] |  |
Balance at beginning of year | $ 36,069 | $ 15,999
Increase in valuation allowance | 63,337 | 20,595
Reversal of valuation allowance |  | (598)
Effect of foreign currency translation | 32 | 73
Balance at end of year | $ 99,438 | $ 36,069

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Deferred tax assets valuation allowance increase. + References No definition available. + Details
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- Definition Deferred tax assets valuation allowance reversal. + References No definition available. + Details
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- Definition Deferred tax assets valuation foreign currency translation. + References No definition available. + Details
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