Annual report pursuant to Section 13 and 15(d)

Accrued Expenses - Summary of Accrued Expenses (Detail)

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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Schedule of Accrued Liabilities [Line Items]    
Accrued expenses $ 1,622,025 $ 1,867,995
Accrued Compensation [Member]    
Schedule of Accrued Liabilities [Line Items]    
Accrued expenses 948,935 997,908
Accrued Legal Expenses [Member]    
Schedule of Accrued Liabilities [Line Items]    
Accrued expenses 445,684 283,160
Accrued Equipment Cost [Member]    
Schedule of Accrued Liabilities [Line Items]    
Accrued expenses   299,500
Other Accrued Expenses [Member]    
Schedule of Accrued Liabilities [Line Items]    
Accrued expenses $ 227,406 $ 287,427