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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid insurance $ 569 $ 202
Prepaid clinical trials 633 322
Prepaid other 209 221
Deferred operating costs 37 32
Total prepaid and other current assets $ 1,448 $ 777