Stock-Based Compensation - Information about Stock Options Outstanding Under all Stock Plans (Detail) shares in Thousands	3 Months Ended
Mar. 31, 2019 $ / shares shares
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	$ 5.00
Upper range of exercise prices	$ 7.15
Options Outstanding, Number \| shares	19,126
Options Outstanding, Weighted Average Contractual Life (Years)	2 years 11 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 6.03
Options Exercisable, Number \| shares	14,416
Options Exercisable, Weighted Average Exercise Price	$ 6.15
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise prices	$ 7.16
Options Outstanding, Number \| shares	195,041
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 10 days
Options Outstanding, Weighted-Average Exercise Price	$ 7.16
Options Exercisable, Number \| shares	195,041
Options Exercisable, Weighted Average Exercise Price	$ 7.16
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise prices	$ 7.22
Options Outstanding, Number \| shares	93,605
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 3 days
Options Outstanding, Weighted-Average Exercise Price	$ 7.22
Options Exercisable, Number \| shares	93,605
Options Exercisable, Weighted Average Exercise Price	$ 7.22
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	7.23
Upper range of exercise prices	$ 8.32
Options Outstanding, Number \| shares	15,500
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 10 months 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 7.83
Options Exercisable, Number \| shares	15,479
Options Exercisable, Weighted Average Exercise Price	$ 7.84
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range of exercise prices	5.00
Upper range of exercise prices	$ 8.32
Options Outstanding, Number \| shares	323,272
Options Outstanding, Weighted Average Contractual Life (Years)	1 year 2 months 1 day
Options Outstanding, Weighted-Average Exercise Price	$ 7.14
Options Exercisable, Number \| shares	318,541
Options Exercisable, Weighted Average Exercise Price	$ 7.16

Share based compensation shares authorized under stock option plans exercise price.

No definition available.

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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.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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