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ALLOWANCE FOR DOUBTFUL ACCOUNTS
 12 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
ALLOWANCE FOR DOUBTFUL ACCOUNTS

A summary follows of activity in the allowance for doubtful accounts during the years ended September 30, 2017 and 2016 follows:
 
 
Years Ended
Allowance for doubtful accounts
 
September 30,
2017
 
September 30,
2016
(in thousands)
 
 
 
 
Allowance, beginning of period
 
$
226

 
$
423

Change in provision for doubtful accounts
 
(144
)
 
96

Write-offs
 
(7
)
 
(293
)
Allowance, end of period
 
$
75

 
$
226