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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]      
Professional fees   $ 0 $ 85
Accrued board compensation $ 0 209 181
Research and development   0 91
Deferred rent   0 10
Other accrued expenses 3 21 16
Total accrued expenses and other current liabilities $ 3 $ 230 $ 383