Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Accounts receivable, net:
Accounts receivable	$ 65,027	$ 60,062
Less allowance for doubtful accounts	3,778	968
Less reserve for future credit returns and pricing adjustments	2,022	2,677
Total accounts receivable, net	59,227	56,417
Inventories:
Raw materials	14,009	12,308
Work in process	0	565
Finished goods	37,559	26,891
Total Inventories	51,568	39,764
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	40,015	38,737
Less accumulated depreciation and amortization	28,508	24,880
Total property, equipment and improvements, net	11,507	13,857
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	7,844	7,646
Equipment
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	17,153	17,440
Purchased Software
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,770	4,030
Furniture and Fixtures
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,236	2,963
Subscriber assets
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	$ 5,104	$ 3,750