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Commitments and Contingencies (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
StatementsLineItems [Line Items]    
Future minimum rentals receivable under non–cancellable operating leases $ 1,160 $ 823
Within one year [Member]    
StatementsLineItems [Line Items]    
Future minimum rentals receivable under non–cancellable operating leases 566 308
After one year but not more than five years [Member]    
StatementsLineItems [Line Items]    
Future minimum rentals receivable under non–cancellable operating leases $ 594 $ 515