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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and Equipment
Total property and equipment	$ 4,935,000	$ 4,322,000
Less: accumulated depreciation and amortization	(3,473,000)	(2,641,000)
Property and equipment, net	1,462,000	1,681,000
Property and equipment income statement disclosure
Depreciation expense	789,000	703,000	$ 527,000
Laboratory equipment
Property and Equipment
Total property and equipment	3,539,000	2,947,000
Furniture and computer equipment
Property and Equipment
Total property and equipment	648,000	512,000
Leasehold improvements
Property and Equipment
Total property and equipment	748,000	863,000
Australia
Property and Equipment
Property and equipment, net	$ 46,000	$ 37,000	$ 200

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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