Stockholders' Equity - Summary of Stock Options Outstanding and Exercisable (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 3.85
Range of Exercise Price, Upper Limit	$ 5.00
Number of Options Outstanding	1,206,798
Weighted Average Exercise Price	$ 4.63
Weighted Average Remaining Contractual Life (Years)	4 years 9 months 18 days
Number of Options Exercisable	1,172,329
Weighted Average Price	$ 4.63
Weighted Average Remaining Contractual Life (Years)	4 years 9 months 18 days
Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 5.01
Range of Exercise Price, Upper Limit	$ 7.00
Number of Options Outstanding	210,663
Weighted Average Exercise Price	$ 5.58
Weighted Average Remaining Contractual Life (Years)	4 years
Number of Options Exercisable	209,838
Weighted Average Price	$ 5.58
Weighted Average Remaining Contractual Life (Years)	4 years
Range Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 7.01
Range of Exercise Price, Upper Limit	$ 10.00
Number of Options Outstanding	151,761
Weighted Average Exercise Price	$ 7.38
Weighted Average Remaining Contractual Life (Years)	2 years 10 months 24 days
Number of Options Exercisable	151,761
Weighted Average Price	$ 7.38
Weighted Average Remaining Contractual Life (Years)	2 years 10 months 24 days
Range Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 10.01
Range of Exercise Price, Upper Limit	$ 16.23
Number of Options Outstanding	71,861
Weighted Average Exercise Price	$ 10.29
Weighted Average Remaining Contractual Life (Years)	2 years 4 months 24 days
Number of Options Exercisable	71,861
Weighted Average Price	$ 10.29
Weighted Average Remaining Contractual Life (Years)	2 years 4 months 24 days
Range Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Price, Lower Limit	$ 3.85
Range of Exercise Price, Upper Limit	$ 16.23
Number of Options Outstanding	1,641,083
Weighted Average Exercise Price	$ 5.26
Weighted Average Remaining Contractual Life (Years)	4 years 4 months 24 days
Number of Options Exercisable	1,605,789
Weighted Average Price	$ 5.27
Weighted Average Remaining Contractual Life (Years)	4 years 4 months 24 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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

-Subparagraph (c)(1)(iii)

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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

+ References

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Number of options outstanding, including both vested and non-vested options.

+ 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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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Publisher FASB

-Name Accounting Standards Codification

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

+ References

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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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