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Balance Sheet Accounts - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Insurance	$ 1,247	$ 221
Clinical trial costs	996	95
Professional fees	72	49
Other	3	30
Prepaid expenses and other current assets	$ 2,318	$ 395

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