Inventory

The components of inventory consisted of the following:



	As of		As of
(in thousands)	December 31, 2016		September 30, 2016
Raw materials	$	16,515	$	16,095
Work in-process	6,996		5,687
Finished goods	8,252		5,899
Inventory balance at end of period	$	31,763	$	27,681
Current portion	$	28,198	$	24,150
Non-Current portion	3,565		3,531
Inventory balance at end of period	$	31,763	$	27,681

The non-current inventory balance of $3.6 million and $3.5 million as of December 31, 2016 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.