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Capitalized Software, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization $ (5,726) $ (3,038)  
Capitalized software, net 15,454 3,372  
Software capitalized during the period 15,067 1,292  
Amortization expense 2,977 1,696 $ 1,541
Software development costs      
Finite-Lived Intangible Assets [Line Items]      
Capitalized software 20,347 6,021  
Development in progress      
Finite-Lived Intangible Assets [Line Items]      
Capitalized software $ 833 $ 389  
Maximum | Software development costs      
Finite-Lived Intangible Assets [Line Items]      
Amortization life 3 years    
Minimum | Software development costs      
Finite-Lived Intangible Assets [Line Items]      
Amortization life 1 year