Income Taxes - Components of Income Tax Provision (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Current:
State	$ 33,477	$ 45,693
Total	33,477	45,693
Deferred:
Federal	199,606	207,019
State	85,073	53,243
Total	284,679	260,262
Income tax provision	$ 318,156	$ 305,955