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Balance Sheet Accounts - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Clinical trial costs $ 1,202 $ 371
Compensation and related benefits 719 606
Professional fees 383 194
Accrued expenses and other current liabilities $ 2,304 $ 1,171