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Goodwill and Intangible Assets - Schedule of Future Estimated Amortization Expense (Detail) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
The remainder of 2019 $ 29,690  
2020 45,933  
2021 25,375  
2022 25,375  
2023 25,375  
2024 and thereafter 189,501  
Intangible assets subject to amortization, Net Book Value $ 341,249 $ 432,957