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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Fair Value Disclosures [Abstract]    
Transfer of assets between Level 1 to Level 2 $ 0 $ 0
Transfer of assets between Level 2 to Level 1 0 0
Transfer of liabilities between Level 1 to Level 2 0 0
Transfer of liabilities between Level 2 to Level 1 $ 0 $ 0