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Additional Information with Respect to Non-vested Options (Detail) - Employee Stock Option $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate intrinsic value	$ 2.1
Weighted-average remaining contractual term	8 years 2 months 12 days
Weighted-average remaining expected term	3 years 2 months 12 days
Weighted-average remaining vesting period	1 year 4 months 24 days
Unrecognized compensation cost	$ 2.6

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Options, Expected to Vest, Aggregate Intrinsic Value

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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