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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule Of Intangible Assets [Line Items]        
Increase in goodwill from recorded adjustments       $ 490,676
Impairment charges       490,676
Research and Development [Member]        
Schedule Of Intangible Assets [Line Items]        
Amortization expense of intangible assets $ 14,836 $ 14,972 $ 107,580 $ 29,446