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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 | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based compensation | $ 246,258 | $ 123,374 | $ 678,508 | $ 336,275 |
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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 | 155,893 | 14,959 | 189,986 | 52,527 |
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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 | $ 90,365 | $ 108,415 | $ 488,522 | $ 283,748 |