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Prepaid Expenses and Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expenses and Other Assets    
Prepaid insurance $ 358 $ 362
Deferred offering costs 569 137
Recoupable deposits and other 261 246
Prepaid expenses and other assets $ 1,188 $ 745