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Notes Payable and Other Liabilities - Summary of Long-term Portion of Outstanding Notes Payable as well as Other Long-Term Liabilities (Detail)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Debt Instrument [Line Items]        
BPI France notes, long-term portion $ 572,770 € 500,000 $ 599,927 € 500,000
Deferred rent, long-term portion 1,045,807   386,489  
Common stock warrant liability (see Note 12) 65,000   3,400,869  
Embedded derivative (see Note 10)     27,236  
Other 240,090   159,986  
Total other long-term liabilities 1,852,071   4,574,507  
BPI France Notes [Member]        
Debt Instrument [Line Items]        
BPI France notes, long-term portion $ 501,174   $ 599,927