Commitments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019
Commitments And Contingencies Disclosure [Abstract]
Lease commencement date			Jan. 01, 2017
Lease expiry date			Dec. 31, 2019
Rent expense	$ 36,000	$ 35,000	$ 109,000	$ 104,000
Operating lease incremental borrowing rate			12.00%
Operating lease ROU	$ 35,398		$ 35,398		$ 136,000
Operating lease liability					$ 136,000