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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Significant Accounting Policies [Line Items]          
Weighted-average shares subject to repurchase excluded from the weighted-average number of common shares outstanding 45,000 49,375 45,000 71,875  
Current portion of long-term debt         $ 126,806
Long-term debt, net of current portion $ 4,368,749   $ 4,368,749   4,196,422
Imputation of Interest [Member]          
Significant Accounting Policies [Line Items]          
Current portion of long-term debt         23,624
Long-term debt, net of current portion         $ 45,026
Officers [Member] | Clinical Trial Services [Member]          
Significant Accounting Policies [Line Items]          
Related Party expenses $ 58,933 $ 121,422 $ 217,977 $ 149,696