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Inventory
9 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventory
Inventory

The components of inventory consisted of the following:

 
As of
 
As of
(in thousands)
June 30,
2017
 
September 30, 2016
Raw materials
$
16,033

 
$
16,095

Work in-process
6,586

 
5,687

Finished goods
6,643

 
5,899

Inventory balance at end of period
$
29,262

 
$
27,681

Current portion
$
26,147

 
$
24,150

Non-Current portion
3,115

 
3,531



The non-current inventory balance of $3.1 million and $3.5 million as of June 30, 2017 and September 30, 2016, respectively, is comprised entirely of raw materials which we acquired as part of a last time purchase as a result of the vendor announcing they would cease manufacturing a part.