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 ($)
Jun. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued compensation costs $ 1,051,603 $ 1,597,414
Accrued research and development service fees 254,911 504,193
Accrued professional fees 193,847 299,912
Accrued facilities operation expenses 160,369 236,296
Accrued licensing fees   180,000
Other accrued liabilities 8,813 50,537
Total accrued liabilities $ 1,669,543 $ 2,868,352