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Nature of Operations and Summary of Significant Accounting Policies - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 2,743 $ 2,505
Less: accumulated depreciation and amortization (2,303) (1,530)
Total property and equipment, net 440 975
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,476 1,281
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 249 229
Leasehold improvements [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,018 $ 995