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Selected Balance Sheet Data (Tables)
 12 Months Ended
Sep. 30, 2018
Selected Balance Sheet Data [Abstract]  
Schedule of Selected Balance Sheet Data
(in thousands)
 
As of September 30,
 
2018
 
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, equipment and improvements, net:
 
 
 
Land
$
570

 
$
1,800

Buildings
2,338

 
10,522

Improvements
1,698

 
3,445

Equipment
15,803

 
17,133

Purchased software
3,966

 
3,571

Furniture and fixtures
3,350

 
3,473

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