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))

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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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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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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

-Topic 718

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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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-Name Accounting Standards Codification

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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.

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Summarizes Information with Respect to Stock Options Outstanding (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jan. 31, 2014	Dec. 17, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share		$ 3.04	$ 2.66
Outstanding Options, Shares	2,213,963
Outstanding Options, Weighted- Average Remaining Contractual Term	8 years 29 days
Weighted Average- Exercise Price	$ 1.56
Exercisable Options, Shares	948,883
Exercisable Options, Weighted- Average Exercise Price	$ 2.33
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	$ 0.56
Outstanding Options, Shares	25,000
Outstanding Options, Weighted- Average Remaining Contractual Term	1 year 10 months 2 days
Weighted Average- Exercise Price	$ 0.56
Exercisable Options, Shares	25,000
Exercisable Options, Weighted- Average Exercise Price	$ 0.56
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	$ 0.69
Outstanding Options, Shares	326,000
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 6 months 29 days
Weighted Average- Exercise Price	$ 0.69
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	$ 0.77
Outstanding Options, Shares	150,000
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 5 months 5 days
Weighted Average- Exercise Price	$ 0.77
Exercisable Options, Shares	25,000
Exercisable Options, Weighted- Average Exercise Price	$ 0.77
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	$ 1.14
Outstanding Options, Shares	990,818
Outstanding Options, Weighted- Average Remaining Contractual Term	8 years 3 months 29 days
Weighted Average- Exercise Price	$ 1.14
Exercisable Options, Shares	176,738
Exercisable Options, Weighted- Average Exercise Price	$ 1.14
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	$ 2.05
Outstanding Options, Shares	17,800
Outstanding Options, Weighted- Average Remaining Contractual Term	9 years 1 month 2 days
Weighted Average- Exercise Price	$ 2.05
Exercisable Options, Shares	17,800
Exercisable Options, Weighted- Average Exercise Price	$ 2.05
Range Of Exercise Prices - Range 6 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 2.27
Outstanding Options, Shares	525,628
Outstanding Options, Weighted- Average Remaining Contractual Term	8 years 5 months 12 days
Weighted Average- Exercise Price	$ 2.27
Exercisable Options, Shares	525,628
Exercisable Options, Weighted- Average Exercise Price	$ 2.27
Range Of Exercise Prices - Range 7 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 3.04
Outstanding Options, Shares	123,717
Outstanding Options, Weighted- Average Remaining Contractual Term	1 year 1 month 10 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 8 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 3.85
Outstanding Options, Shares	40,000
Outstanding Options, Weighted- Average Remaining Contractual Term	7 years 7 months 6 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 9 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Per Share	$ 14.30
Outstanding Options, Shares	15,000
Outstanding Options, Weighted- Average Remaining Contractual Term	11 months 16 days
Weighted Average- Exercise Price	$ 14.30
Exercisable Options, Shares	15,000
Exercisable Options, Weighted- Average Exercise Price	$ 14.30