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Acquisition - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Jul. 10, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]          
Goodwill $ 59,467 $ 59,819   $ 45,388 $ 45,134
Machinio          
Business Acquisition [Line Items]          
Other Current Assets     $ 106    
Goodwill     14,558    
Property and equipment and other long-term assets     252    
Liabilities excluding deferred revenue     (956)    
Deferred revenue     (1,400)    
Total consideration     19,860    
Customer relationships intangible asset | Machinio          
Business Acquisition [Line Items]          
Intangible assets     3,100    
Developed technology intangible asset | Machinio          
Business Acquisition [Line Items]          
Intangible assets     2,700    
Trade name intangible asset | Machinio          
Business Acquisition [Line Items]          
Intangible assets     $ 1,500