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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Tables)
 12 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Allowance for Credit Losses on Financing Receivables
A summary of activity in the allowance for doubtful accounts during the years ended September 30, 2018 and 2017 is as follows:
 
 
Years Ended
Allowance for doubtful accounts
 
September 30,
2018
 
September 30,
2017
(in thousands)
 
 
 
 
Allowance, beginning of period
 
$
75

 
$
226

Change in provision for doubtful accounts
 
10

 
(144
)
Write-offs
 
—

 
(7
)
Allowance, end of period
 
$
85

 
$
75