Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Computed at statutory rate	$ (1,757,000)	$ (8,943,000)
Tax differential on non-U.S. earnings	44,000	56,000
State income taxes	(172,000)	(2,131,000)
Meals and entertainment	83,000	76,000
Alternative minimum tax credits	(13,000)	(433,000)
GILTI inclusion	4,859,000	0
(Decrease) increase in valuation allowance	(1,046,000)	7,910,000
Repatriation transition tax impact	0	1,383,000
Adjustments to net operating losses	4,000	1,879,000
Other – net	106,000	471,000
Total income tax provision	$ 2,108,000	$ 268,000