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Accounts Receivable
 12 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable

The components of accounts receivable consisted of the following:


As of

As of
(in thousands)
September 30,
2017

September 30, 2016
Accounts receivable, gross
$
22,287

 
$
18,468

Allowance for doubtful accounts
(22
)
 
(36
)
Accounts receivable, net
$
22,265

 
$
18,432



The allowance for doubtful accounts is based on the age of receivables and a specific identification of receivables considered at risk of collection.

The following table summarizes changes in the allowance for doubtful accounts for the fiscal years ended September 30, 2017, 2016 and 2015.

Allowance for Doubtful Accounts
(in thousands)
For the Fiscal Years Ended September 30,
 
2017
 
2016
 
2015
Balance at beginning of period
$
36

 
$
462

 
$
116

Provision adjustment - expense, net of recoveries
23

 
23

 
556

Write-offs and other adjustments - deductions to receivable balances
(37
)
 
(449
)
 
(210
)
Balance at end of period
$
22

 
$
36

 
$
462