Income Taxes (Income Tax Rate Reconciliation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	21.00%	21.00%
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
United States federal tax expense (benefit) at statutory rate	$ (1,062,000)	$ (3,050,000)
State taxes, net of United States federal tax expense (benefit)	(807,000)	629,000
Change in valuation allowance	2,545,000	2,528,000
Non-deductible stock compensation	1,406,000	253,000
Impact of non-U.S. jurisdictional tax rate difference	(169,000)	(116,000)
Research and development tax credit	(183,000)	(67,000)
Non-U.S. withholding tax	229,000	170,000
Change in indefinite reinvestment assertion	(8,000)	(72,000)
Effective Income Tax Rate Reconciliation, Change in Contingent Consideration Liability Fair Value From Acquisition	(1,806,000)	210,000
Other	(90,000)	217,000
Total income tax expense (benefit)	$ 55,000	$ 702,000