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Share-Based Compensation - Schedule of Share-Based Compensation Expense is Classified in Condensed Consolidated Statements of Comprehensive Loss (Detail) (USD $)
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3 Months Ended | |
|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation | $ 388,925 | $ 105,085 |
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Research and Development Expenses [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation | 15,420 | 21,458 |
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Administrative Expenses [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation | $ 373,505 | $ 83,627 |