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Composition of Certain Consolidated Financial Statement Items - Interest and Other Income (Expense), net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 76	$ 184
Decrease in fair value of preferred stock warrants	64	185
Decrease (increase) in fair value of loan facility derivative liability	135	(300)
Other	(154)	(25)
Total interest and other income, net	$ 121	$ 44

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Interest And Other Income (Expense)

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of income (expense) related to nonoperating activities, classified as other.

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