Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax Reform adjustment	$ (798,000)	$ 0	$ 798,000	$ 877,400,000
Operating loss carryforwards		37,300,000
Operating loss carryforwards, subject to expiration		34,100,000
Operating loss carryforwards, not subject to expiration		3,200,000
Deferred tax assets, valuation allowance		0
Uncertain tax positions	0	0	0	0
Penalties and interest expense (income)		55,000	0	$ (5,000)
Amount of accrued interest or penalties	$ 0	$ 0	$ 0