Quarterly report pursuant to Section 13 or 15(d)

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

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Commitments and Contingencies - MBO Bonus Plan - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Executive Officers [Member]    
Commitments And Contingencies [Line Items]    
Accrued bonus expense $ 314,513 $ 267,296