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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, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Total Stock based compensation | $ 78,207 | $ (3,576) | $ 85,822 | $ 257,827 |
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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 | 2,504 | (11,848) | (24,593) | 10,868 |
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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 | $ 75,703 | $ 8,272 | $ 110,415 | $ 246,959 |