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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 05, 2016
Aug. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]          
Cash consideration     $ 2,479 $ 0 $ 0
Tremont Realty Capital LLC          
Business Acquisition [Line Items]          
Cash consideration $ 2,466 $ 2,466      
Contingent consideration $ 1,270 $ 1,270 $ 1,257    
Duration of potential earn out (in years) 2 years 2 years