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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 | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based compensation | $ 43,325 | $ 107,817 | $ 432,250 | $ 212,902 |
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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 | 15,473 | 15,218 | 30,993 | 36,676 |
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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 | $ 27,752 | $ 92,599 | $ 401,257 | $ 176,226 |