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Notes Payable and Other Long-Term Liabilities - Summary of Long-term Portion of Outstanding Notes Payable as well as Other Long-Term Liabilities (Detail) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Lease obligation, long-term portion (see Note 11) $ 1,552,031  
Deferred rent, long-term portion   $ 1,045,807
Common stock warrant liability (see Note 9) 10,000 65,000
Other 225,172 240,090
Total other long-term liabilities $ 1,787,203 1,852,071
BPI France Notes [Member]    
Debt Instrument [Line Items]    
BPI France notes, long-term portion   $ 501,174