Inventory

The components of inventory consisted of the following:



	As of		As of
(in thousands)	March 31, 2018		September 30, 2017
Raw materials	$	13,352	$	15,826
Work in-process	5,121		6,586
Finished goods	8,032		5,413
Inventory balance at end of period	$	26,505	$	27,825
Current portion	$	23,726	$	25,139
Non-Current portion	$	2,779	$	2,686

The non-current inventory balance of $2.8 million and $2.7 million as of March 31, 2018 and September 30, 2017, respectively, 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.