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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Clinical trial expenses $ 1,497 $ 1,497
Insurance premiums 498 845
Professional services 125 66
Other 249 262
Total prepaid expenses and other current assets $ 2,369 $ 2,670