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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Accounts receivable, net:    
Accounts receivable $ 54,451 $ 31,365
Less allowance for doubtful accounts 1,074 341
Less reserve for future returns and pricing adjustments 2,560 2,169
Total accounts receivable, net 50,817 28,855
Inventories:    
Raw materials 22,047 24,050
Work in process 525 484
Finished goods 19,072 5,704
Total Inventories 41,644 30,238
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross 27,725 39,944
Less accumulated depreciation and amortization 21,455 27,143
Total property, equipment and improvements, net 6,270 12,801
Land    
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross 570 1,800
Buildings    
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross 2,338 10,522
Improvements    
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross 1,698 3,445
Equipment    
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross 15,803 17,133
Purchased Software    
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross 3,966 3,571
Furniture and Fixtures    
Property, Plant and Equipment, Net    
Total property, equipment and improvements, gross $ 3,350 $ 3,473