Balance Sheet Details (Property and Equipment) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 14,720,000	$ 12,445,000
Less: accumulated depreciation	(11,103,000)	(10,225,000)
Property and equipment, net	3,617,000	2,220,000
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	10,007,000	7,754,000
Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	449,000	451,000
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	$ 3,423,000