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Accounts Receivable (Tables)
 12 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The components of accounts receivable consisted of the following:


 
As of
(in thousands)
 
September 30, 2019

September 30, 2018
Accounts receivable, gross
 
$
18,645

 
$
19,823

Allowance for doubtful accounts
 
(148
)
 
(548
)
Accounts receivable, net
 
$
18,497

 
$
19,275

The following table summarizes changes in the allowance for doubtful accounts for the fiscal years ended September 30, 2019, 2018 and 2017.

Allowance for Doubtful Accounts
(in thousands)
 
For the Fiscal Years ended September 30,
 
 
2019
 
2018
 
2017
Balance at beginning of period
 
$
548

 
$
22

 
$
36

Provision adjustment - expense, net of recoveries
 
62

 
599

 
23

Write-offs and other adjustments - deductions to receivable balances
 
(462
)
 
(73
)
 
(37
)
Balance at end of period
 
$
148

 
$
548

 
$
22