Summarizes Information with Respect to Stock Options Outstanding (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 17, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 14.30	$ 2.66
Outstanding Options, Shares	2,417,918
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 1 month 13 days
Weighted Average- Exercise Price	$ 2.59
Exercisable Options, Shares	676,275
Exercisable Options, Weighted- Average Exercise Price	$ 2.77
Range of Exercise Prices - Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 0.77
Outstanding Options, Shares	150,000
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 11 months 1 day
Weighted Average- Exercise Price	$ 0.77
Exercisable Options, Shares	0
Exercisable Options, Weighted- Average Exercise Price	$ 0
Range of Exercise Prices - Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 2.05
Outstanding Options, Shares	56,900
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 6 months 29 days
Weighted Average- Exercise Price	$ 2.05
Exercisable Options, Shares	0
Exercisable Options, Weighted- Average Exercise Price	$ 0
Range of Exercise Prices - Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 2.27
Outstanding Options, Shares	1,293,720
Outstanding Options, Weighted- Average Remaining Contractual Term	8 years 11 months 8 days
Weighted Average- Exercise Price	$ 2.27
Exercisable Options, Shares	497,558
Exercisable Options, Weighted- Average Exercise Price	$ 2.27
Range of Exercise Prices - Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 3.04
Outstanding Options, Shares	742,298
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 3 months 29 days
Weighted Average- Exercise Price	$ 3.04
Exercisable Options, Shares	123,717
Exercisable Options, Weighted- Average Exercise Price	$ 3.04
Range of Exercise Prices - Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 3.85
Outstanding Options, Shares	160,000
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 5 months 12 days
Weighted Average- Exercise Price	$ 3.85
Exercisable Options, Shares	40,000
Exercisable Options, Weighted- Average Exercise Price	$ 3.85
Range Of Exercise Prices - Range 6 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Options, Shares	15,000
Outstanding Options, Weighted- Average Remaining Contractual Term	1 year 5 months 12 days
Weighted Average- Exercise Price	$ 14.30
Exercisable Options, Shares	15,000
Exercisable Options, Weighted- Average Exercise Price	$ 14.30

Exercise price per share or per unit of warrants or rights outstanding.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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)

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

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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.

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-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.

+ 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)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

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

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