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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense and effect on net loss	$ 1,426,242	$ 508,811	$ 4,086,710	$ 1,543,577
Effect on basic and diluted net loss per share	$ (0.01)	$ (0.01)	$ (0.04)	$ (0.03)
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense and effect on net loss	$ 781,791	$ 188,357	$ 2,063,499	$ 414,246
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense and effect on net loss	$ 644,451	$ 320,454	$ 2,023,211	$ 1,129,331

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- Definition

Share Based Compensation Impact On Basic And Diluted Earnings Per Share

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 14.F)



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-Section 50



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



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-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



-Number Topic 14



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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.

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