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Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,397		$ 9,060
Less: Accumulated depreciation	(8,537)		(8,457)
Property and equipment, net	860		603
Depreciation	80	$ 74
Machinery, equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,043		3,742
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,952		2,916
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,402		$ 2,402

X

- 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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