Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	[1]	Sep. 30, 2017
Accounts receivable, net:
Accounts receivable	$ 60,062	$ 53,164
Less allowance for doubtful accounts	968	785
Less reserve for future returns and pricing adjustments	2,677	2,560
Total accounts receivable, net	56,417	49,819		$ 28,855
Inventories:
Raw materials	12,308	22,047
Work in process	565	525
Finished goods	26,891	19,072
Total Inventories	39,764	41,644
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	38,737	30,398
Less accumulated depreciation and amortization	24,880	22,044
Total property, equipment and improvements, net	13,857	8,354		$ 13,241
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	7,646	1,698
Equipment
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	17,440	15,803
Purchased Software
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	4,030	3,966
Furniture and Fixtures
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	2,963	3,350
Subscriber assets
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	$ 3,750	$ 2,673

[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.