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Prepaid Expenses and Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Prepaid Expenses and Other Assets    
Prepaid insurance $ 527 $ 571
Recoupable deposits and other 563 559
Prepaid expenses and other assets 1,090 $ 1,130
Receivables for Reimbursement of Costs $ 200