Leases - Reconciliation of Undiscounted Lease Liabilities to Total Lease Liabilities (Detail) - USD ($)	Mar. 31, 2019	Jan. 01, 2019
Undiscounted lease liabilities for years ending December 31,:
2019 (remaining)	$ 123,127
2020	167,813
2021	123,714
2022	45,850
Total undiscounted lease liabilities	460,504
Less effects of discounting	(50,633)
Total lease liabilities	409,871	$ 400,000
Operating lease liability, current	164,629
Operating lease liability, non-current	245,242
Total lease liabilities	$ 409,871	$ 400,000