Income Taxes (Components of Deferred Tax Assets) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets, Net [Abstract]
Net operating loss carry-forwards	$ 42,525,000	$ 36,405,000
Capitalized research and development	19,103,000	16,306,000
Stock-based compensation	3,192,000	2,467,000
Depreciation and amortization	929,000	1,301,000
Lease accounting	13,660,000	10,631,000
Other	1,452,000	1,174,000
Total deferred tax assets before valuation allowance	80,861,000	68,284,000
Less: valuation allowance	(68,818,000)	(58,251,000)
Total deferred tax assets after valuation allowance	12,043,000	10,033,000
Deferred Tax Liabilities, Net [Abstract]
Right-of-use asset	(12,043,000)	(10,033,000)
In-process research and development	(3,077,000)	(3,077,000)
Total deferred tax liabilities	15,120,000	13,110,000
Net deferred tax liability	$ (3,077,000)	$ (3,077,000)