Commitments - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019
Commitments And Contingencies Disclosure [Abstract]
Lease commencement date	Jan. 01, 2017
Lease expiry date	Dec. 31, 2019
Rent expense	$ 38,000	$ 35,000
Operating lease incremental borrowing rate	12.00%
Operating lease ROU	$ 103,252		$ 136,000
Operating lease liability			$ 136,000