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Stock-based Compensation - Stock-based Compensation Expense Recognized (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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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Total Stock based compensation | $ 251,176 | $ 78,207 | $ 256,721 | $ 85,822 |
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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 | 127,730 | 2,504 | 137,767 | (24,593) |
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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 | $ 123,446 | $ 75,703 | $ 118,954 | $ 110,415 |