Inventory

The components of inventory consisted of the following:



	As of		As of
(in thousands)	September 30, 2017		September 30, 2016
Raw materials	$	15,826	$	16,095
Work in-process	6,586		5,687
Finished goods	5,414		5,899
Inventory balance at end of period	$	27,826	$	27,681
Current portion	$	25,139	$	24,150
Non-Current portion	$	2,686	$	3,531

The non-current inventory balance of $2.7 million and $3.5 million as of September 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.