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Balance Sheet Accounts - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Clinical trial costs	$ 1,309	$ 95
Insurance	217	221
Professional fees	36	49
Other	27	30
Prepaid expenses and other current assets	$ 1,589	$ 395

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Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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