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Commitments and Contingencies (Tables)
12 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Operating Lease Payments
The following table summarizes the future minimum lease payments due under operating leases as of September 30, 2018 (in thousands):
 
Year ending September 30,
 
 
2019
 
$
1,316

2020
 
1,382

2021
 
1,017

2022
 
1,070

2023
 
1,037

Thereafter
 
1,300

Total
 
$
7,122