Organization and Description of Business (Details) - USD ($)		3 Months Ended
	Apr. 08, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Nature of Operations
Accumulated deficit		$ 398,886,000		$ 387,117,000
Cash, cash equivalents and marketable securities		3,700,000
Working capital deficit		11,500,000
General and Administrative Expense		3,997,000	$ 3,801,000
Research and Development Expense		$ 1,257,000	2,123,000
Revision of Prior Period, Error Correction, Adjustment [Member]
Nature of Operations
General and Administrative Expense			(90,000)
Research and Development Expense			$ 10,000
Subsequent Event [Member]
Nature of Operations
Proceeds from Sale of Net Operating Losses	$ 4,700,000