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Nature of Operations and Summary of Significant Accounting Policies - Revenues and Long-Term Assets Information Concerning Principal Geographic Areas (Detail) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]    
Net revenues $ 69,991,000 $ 39,230,000
Long-Term Assets 5,292,000 7,778,000
United States [Member]    
Segment Reporting Information [Line Items]    
Net revenues 69,991,000 39,230,000
Long-Term Assets $ 5,292,000 $ 7,778,000