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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 71,875 45,000 83,125  
Current portion of long-term debt $ 1,251,806   $ 1,251,806   $ 126,806
Long-term debt, net of current portion 3,101,770   3,101,770   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 $ 71,019 $ 28,274 $ 159,044 $ 28,274