Commitments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Disclosure - Commitments - Additional Information (Detail) [Line Items]
Lease commencement date	Jan. 01, 2017
Lease expiry date	Dec. 31, 2020
Operating lease incremental borrowing rate	12.00%
Operating lease ROU	$ 138,538		$ 136,000
Operating lease liability	138,538		136,000
Rent expense	145,000	$ 139,000
Future minimum facility lease payments due in 2020	146,000
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease ROU	138,538		136,000
Operating lease liability	138,538		$ 136,000
Accounting Standards Update 2016-02
Disclosure - Commitments - Additional Information (Detail) [Line Items]
Operating lease ROU	139,000
Operating lease liability	139,000
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease ROU	139,000
Operating lease liability	$ 139,000