Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Summary of Accrued Liabilities (Detail)

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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued compensation costs $ 682,776 $ 1,597,414
Accrued research and development service fees 133,564 504,193
Accrued professional fees 358,491 299,912
Accrued facilities operation expenses 227,041 236,296
Accrued licensing fees   180,000
Other accrued liabilities 7,170 50,537
Total accrued liabilities $ 1,409,042 $ 2,868,352