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Income Taxes - Summary of Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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- References

No definition available.

+ Details

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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

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- Definition

Deferred tax assets valuation allowance increase.

+ References

No definition available.

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- Definition

Deferred tax assets valuation allowance reversal.

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- Definition

Deferred tax assets valuation foreign currency translation.

+ References

No definition available.

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