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Accounts Payable and Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts Payable and Other Accrued Liabilities    
Accounts payable $ 263 $ 560
Accrued expenses 955 1,240
Accrued compensation 2,565 1,964
Other 260 260
Total accounts payable and other current liabilities $ 4,043 $ 4,024