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Intangible Assets, Net and Goodwill - Schedule of Future Estimated Amortization Expense (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 59,377  
2020 45,930  
2021 25,371  
2022 25,371  
2023 25,371  
2024 and thereafter 251,537  
Intangible assets subject to amortization, Net Book Value $ 432,957 $ 476,399