Stock-Based Compensation - Employee Stock Purchase Plan ("ESPP") - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Feb. 28, 2017	Feb. 29, 2016	Mar. 31, 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	$ 0.4
Options issued	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 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

The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

+ 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=6415400&loc=d3e5070-113901

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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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- Details

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