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Stock-based Compensation - Stock-based Compensation Expense Recognized (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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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total Stock based compensation | $ 5,545 | $ 7,615 |
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Research and Development Expense [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total Stock based compensation | 10,037 | (27,097) |
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Selling, General and Administrative Expenses [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total Stock based compensation | $ (4,492) | $ 34,712 |