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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, 2015
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Mar. 31, 2014
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total Stock based compensation | $ 112,140 | $ 5,545 |
| Research and Development Expense [Member] | ||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total Stock based compensation | 20,917 | 10,037 |
| Selling, General and Administrative Expenses [Member] | ||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||
| Total Stock based compensation | $ 91,223 | $ (4,492) |