Related Party Transactions - Incurred Charges included in Loss from Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Total charges incurred	$ 570,525	$ 593,933
Rent [Member]
Related Party Transaction [Line Items]
Total charges incurred	557,698	548,229
Personnel [Member]
Related Party Transaction [Line Items]
Total charges incurred	6,493	39,721
Other [Member]
Related Party Transaction [Line Items]
Total charges incurred	$ 6,334	$ 5,983