Net Loss per Share (Computation of basic and diluted net loss per share) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic and diluted net loss per common share calculation:
Net loss attributable to common shareholders - basic	$ (3,547,000)	$ (9,215,000)	$ (18,037,000)	$ (17,989,000)
Change in fair value of convertible debt	6,036,000		2,874,000
Net loss attributable to common shareholders - diluted	$ (9,583,000)	$ (9,215,000)	$ (20,911,000)	$ (17,989,000)
Weighted average common shares outstanding - basic	36,068,130	35,999,642	36,056,649	32,517,416
Net loss per share of common stock - basic	$ (0.10)	$ (0.26)	$ (0.50)	$ (0.55)
Weighted average common shares outstanding - diluted	56,544,698	35,999,642	36,056,649	32,517,416
Net loss per share of common stock - diluted	$ (0.17)	$ (0.26)	$ (0.50)	$ (0.55)