Employee stock purchase plan offering periods.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions volatility period.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award other than purchase price of common stock percent.

+ References

No definition available.

+ Details

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- Definition

Amount of cash inflow from issuance of shares under share-based compensation arrangement, excluding stock option exercises.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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

+ Details

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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Period Type:	duration

- Details

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- Details

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Stock-Based Compensation - Employee Stock Purchase Plan ("ESPP") - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended				9 Months Ended
	Aug. 31, 2017	Feb. 28, 2017	Aug. 31, 2016	Feb. 29, 2016	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period					6 months
Employee Stock Purchase Plan ("ESPP") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value to determine purchase price	85.00%
Proceeds of from issuance of shares under ESPP	$ 0.3	$ 0.3		$ 0.4
Options issued	67,383	72,218		78,415
Rate of discount on fair market value of common stock under ESPP					15.00%
Period of expected life, options granted					5 years
Employee Stock Purchase Plan ("ESPP") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds of from issuance of shares under ESPP			$ 0.3
Options issued			67,533