Inventory

The components of inventory consisted of the following:



	As of		As of
(in thousands)	September 30, 2016		September 30, 2015
Raw materials	$	16,095	$	9,261
Work in-process	5,687		3,207
Finished goods	5,899		4,662
Inventory balance at end of period	$	27,681	$	17,130
Current portion	$	24,150	$	17,130
Non-Current portion	3,531		—
Inventory balance at end of period	$	27,681	$	17,130

The non-current inventory balance of $3.5 million as of September 30, 2016 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.