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Capitalized Software Development Costs - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Capitalized Computer Software Net [Line Items]
Software not yet placed into service, included in other assets, non-current	$ 10,587	$ 4,636
Capitalized Software Development
Capitalized Computer Software Net [Line Items]
Software development costs	3,500	2,400	$ 1,800
Amortization expenses	1,900	$ 1,400	$ 900
Estimated amortization in 2018	1,900
Estimated amortization in 2019	800
Software not yet placed into service, included in other assets, non-current	$ 1,700

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- Definition

Capitalized computer software amortization expense next twelve months.

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- Definition

Capitalized computer software amortization expense year two.

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- Definition

Capitalized computer software net.

+ References

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- Definition

Additions made to capitalized computer software costs during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Amount of expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

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-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of noncurrent assets classified as other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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