Inventory

The components of inventory consisted of the following:



	As of
(in thousands)	December 31, 2018		September 30, 2018
Raw materials	$	11,951	$	11,857
Work in-process	5,515		5,402
Finished goods	4,415		5,024
Inventory balance at end of period	$	21,881	$	22,283
Current portion	$	20,466	$	20,850
Non-Current portion	$	1,415	$	1,433

The non-current inventory balance of $1.4 million as of both December 31, 2018 and September 30, 2018 is comprised entirely of raw materials which we acquired as part of a last time purchase as a result of the vendor announcing it would cease manufacturing a part. During the three months ended December 31, 2018, we recorded a $0.4 million reserve on non-current inventory due to the decline in sales and future demand of the inventory.