Balance Sheet Details (Property and Equipment) (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 16,770,000	$ 14,720,000
Less: accumulated depreciation	(11,333,000)	(11,103,000)
Property and equipment, net	5,437,000	3,617,000
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	12,057,000	10,007,000
Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	449,000	449,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	817,000	817,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,447,000	$ 3,447,000