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Intangible Assets, Net - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 USD ($)
Intangible Liability Disclosure [Abstract]
Impairment of intangible asset	$ 0

X

- Definition

Intangible Liability Disclosure [Abstract]

+ References

No definition available.

+ Details

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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