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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