Segment Information and Major Customers Net Property, Equipment and Improvements by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, equipment and improvements	$ 11,507	$ 13,857
North America, primarily United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, equipment and improvements	11,297	13,400
International, primarily Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net property, equipment and improvements	$ 210	$ 457