Inventory

The components of inventory consisted of the following:



	As of
(in thousands)	September 30, 2019		September 30, 2018
Raw materials	$	11,510	$	11,857
Work in-process	8,176		5,402
Finished goods	4,365		5,024
Inventory balance at end of period	$	24,051	$	22,283
Current portion	$	24,051	$	20,850
Non-Current portion	$	—	$	1,433

The non-current inventory balance of $0 and $1.4 million as of September 30, 2019 and 2018, 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. During the fiscal years ended September 30, 2019 and 2018, we recorded a $1.3 million and $1.0 million, write-down, respectively, on non-current inventory due to the decline in sales and future demand of the inventory. There was no write-down recorded on non-current inventory in the fiscal year ended September 30, 2017.