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Build-to-Suit Lease (Tables)
12 Months Ended
Sep. 30, 2018
Leases [Abstract]  
Future minimum lease payments
Future minimum lease payments under the Lisle, Illinois and Long Beach, California leases as of September 30, 2018 are as follows:

Years ending September 30,
 

2019
 
$
4,646

2020
 
4,772

2021
 
4,902

2022
 
5,035

2023
 
5,171

Thereafter
 
44,795

Total future minimum lease obligation
 
$
69,321

Less imputed interest on financing obligation
 
(26,727
)
Less imputed accrued land lease obligation
 
(560
)
Net present value of financing obligation
 
$
42,034