Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Accounts receivable, net:
Accounts receivable	$ 51,828	$ 65,027
Less allowance for doubtful accounts	3,934	3,778
Less reserve for future credit returns and pricing adjustments	4,156	2,022
Total accounts receivable, net	43,738	59,227
Inventories:
Raw materials	27,265	14,009
Work in process	14	0
Finished goods	16,642	37,559
Total Inventories	43,921	51,568
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	41,177	40,015
Less accumulated depreciation and amortization	29,045	28,508
Total property, equipment and improvements, net	12,132	11,507
Land
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	570	570
Buildings
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	2,338	2,338
Improvements
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	9,367	7,844
Equipment
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	16,878	17,153
Purchased Software
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	2,868	3,770
Furniture and Fixtures
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	2,174	3,236
Subscriber assets
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	$ 6,982	$ 5,104