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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Components of Deferred Profit
The components of deferred profit are as follows (in thousands):
 
 
September 30,
 
2018
 
2017
Deferred revenue
$
5,616

 
$
6,822

Deferred costs
2,545

 
2,741

Deferred profit
$
3,071

 
$
4,081
Schedule of Product Warranty Liability
The following is a summary of activity in accrued warranty expense (in thousands):
 
 
Years Ended September 30,
 
2018
 
2017
 
2016
Beginning balance
$
1,254

 
$
795

 
$
793

Additions for warranties issued during the period
1,567

 
1,723

 
1,074

Reductions in the liability for payments made under the warranty
(910
)
 
(414
)
 
(832
)
Changes related to pre-existing warranties
(865
)
 
(872
)
 
(250
)
Currency translation adjustment
(6
)
 
22

 
10

Ending balance
$
1,040

 
$
1,254

 
$
795
Research and Development Expense
The following is a summary of our research, development and engineering expense (in thousands):
 
 
Years Ended September 30,
 
2018
 
2017
 
2016
Research, development and engineering
$
9,237

 
$
7,001

 
$
9,535

Grants earned
(1,437
)
 
(629
)
 
(1,531
)
Net research, development and engineering
$
7,800

 
$
6,372

 
$
8,004