Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards	$ 9,300,000
Unrecognized Tax Benefits	$ 0
Federal statutory rate	21.00%	21.00%	35.00%
Annual effective income tax rate, percentage	19.00%	19.00%	47.00%
Net deferred tax asset	$ 16,862,000	$ 23,566,000
Alternative minimum tax credit carryforward	216,000	216,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0	$ 346,000	$ (16,709,000)