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Share-Based Compensation - Schedule of Share-Based Compensation Expense is Classified in Consolidated Statements of Comprehensive Loss (Detail) (USD $)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation | $ 431,504 | $ 339,780 |
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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 | 60,980 | 41,851 |
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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 | $ 370,524 | $ 297,929 |