Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - MBO Bonus Plan - Additional Information (Detail)

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Commitments and Contingencies - MBO Bonus Plan - Additional Information (Detail) - Executive Officers [Member]
12 Months Ended
Dec. 31, 2018
USD ($)
Commitments And Contingencies [Line Items]  
Expense recognized by company $ 1,440,671
Accrued Expenses [Member]  
Commitments And Contingencies [Line Items]  
Bonus accrued but not yet paid $ 234,675