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Acquired Intangible Assets (Detail) - Intangible assets - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Impaired Intangible Assets [Abstract]    
Gross $ 1,173 $ 1,173
Accumulated Amortization 886 757
Net $ 287 $ 416
Customer list    
Impaired Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period 3 years 4 years
Gross $ 910 $ 910
Accumulated Amortization 682 591
Net $ 228 $ 319
Non-compete agreements    
Impaired Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period 0 years 0 years
Gross $ 93 $ 93
Accumulated Amortization 93 93
Net $ 0 $ 0
Developed technology    
Impaired Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period 0 years 1 year
Gross $ 30 $ 30
Accumulated Amortization 29 19
Net $ 1 $ 11
Trade name    
Impaired Intangible Assets [Abstract]    
Weighted Average Remaining Amortization Period 2 years 3 years
Gross $ 140 $ 140
Accumulated Amortization 82 54
Net $ 58 $ 86