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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018
Significant Accounting Policies [Line Items]
Revenue recognition performance obligation, expected time satisfaction period	12 months
ASC 606 [Member]
Significant Accounting Policies [Line Items]
Revenue, practical expedient, incremental costs of obtaining contract	true
Accounting Standards Update No. 2016-16 [Member]
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment to retained earnings		$ 0.4

X

- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
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X

- Definition

Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification
-Topic 606
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-Paragraph 13
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- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

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