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Goodwill and Intangible Assets - Future Amortization Expense of Finite-lived Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 992  
2017 3,389  
2018 2,640  
2019 2,069  
2020 1,521  
Thereafter 1,664  
Net intangible assets, end of period $ 12,275 $ 16,963