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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses and other current assets $ 4,346 $ 3,105
Prepaid rent 0 106
Deferred rental income 259 170
Total prepaid expenses and other current assets $ 4,605 $ 3,381