Segment Data and Related Information (Schedule of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Segment revenue	$ 33,530	$ 27,266	$ 23,850	$ 25,482	$ 24,300	$ 17,219	$ 21,745	$ 24,001	$ 110,128	$ 87,265	$ 85,617
United States and Canada
Segment Reporting Information [Line Items]
Segment revenue									91,205	68,607	69,543
Asia
Segment Reporting Information [Line Items]
Segment revenue									9,397	11,637	10,386
Europe
Segment Reporting Information [Line Items]
Segment revenue									5,559	6,209	5,422
Other
Segment Reporting Information [Line Items]
Segment revenue									$ 3,967	$ 812	$ 266