Leases - Reconciliation of Undiscounted Lease Liabilities to Total Lease Liabilities (Detail) - USD ($)	Sep. 30, 2019	Jan. 01, 2019
Undiscounted lease liabilities for years ending December 31,:
2019 (remaining)	$ 56,652
2020	229,323
2021	186,784
2022	72,400
Total undiscounted lease liabilities	545,159
Less effects of discounting	(52,957)
Total lease liabilities as of September 30, 2019	492,202	$ 400,000
Operating lease liability, current	227,872
Operating lease liability, non-current	264,330
Total lease liabilities	$ 492,202	$ 400,000