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Employee Benefit Plan - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
The 401k profit sharing plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Expense $ 454,439 $ 364,653
Defined contribution Plan Eligibility Employees become eligible to participate in the discretionary contributions after one year of continuous service and the benefits vest over a five-year period  
Employee stock ownership plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Shares Issued Under Employee Benefit plan 79,800 79,800
Maximum [Member] | The 401k profit sharing plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Employer Matching Contribution 5.00%