Balance Sheet Components - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Land, Property and Equipment
Total property and equipment at cost	$ 942,000	$ 935,000
Accumulated depreciation	(265,000)	(225,000)
Property and equipment, net	677,000	710,000
Depreciation and amortization expense	1,727,000	1,737,000
Animal Health
Land, Property and Equipment
Depreciation and amortization expense	40,000	50,000
Land
Land, Property and Equipment
Total property and equipment at cost	396,000	396,000
Lab equipment
Land, Property and Equipment
Total property and equipment at cost	418,000	411,000
Clinical equipment
Land, Property and Equipment
Total property and equipment at cost	65,000	65,000
Software
Land, Property and Equipment
Total property and equipment at cost	$ 63,000	$ 63,000