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Balance Sheet Accounts - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Insurance	$ 693	$ 200
Clinical trial costs	181	224
Professional fees	125	49
Other	31	84
Prepaid expenses and other current assets	$ 1,030	$ 557

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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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