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Revenue Recognition (Tables)
 12 Months Ended
Sep. 30, 2019
Revenue Recognition [Abstract]  
Schedule of Contract Assets and Contract Liabilities
The following table summarizes the balances of the Company's unbilled receivables (contract assets), which are reported in Other current assets, and its customer advances (contract liabilities), which are reported in Accrued expenses.     
 
 
2018

 
2019

Unbilled receivables (contract assets)
 
$
321

 
456

Customer advances (contract liabilities)
 
(510
)
 
(519
)
      Net contract liabilities
 
$
(189
)
 
(63
)