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Income Taxes - Schedule of Reconciliation of Income Tax Provision to Statutory Federal Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income taxes at statutory rates	$ (521,383)	$ 396,760	$ 1,272,242
State income tax, net of federal benefit	10,774	3,910	2,054
Permanent items	17,771	(5,060)	68,944
Meals and entertainment	46,983	74,755	54,375
Equity based compensation	(99,007)	(645,512)	48,385
Warrant liability			(156,498)
Corporate tax rate change - impact on deferred income taxes		2,768,458
Research and development credit	(195,336)	206,801	(141,494)
Federal NOL adjustment		(386,441)	(206,133)
Federal return to provision	(167,755)	53,265	11,104
Other federal credits		112,262
Other	64,196	15,695
Change in federal valuation allowance	945,300	(2,569,208)	(944,798)
Total tax provision	$ 101,543	$ 25,685	$ 8,181

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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