Inventory

The components of inventory consisted of the following:



	As of
(in thousands)	June 30, 2019		September 30, 2018
Raw materials	$	17,931	$	11,857
Work in-process	9,249		5,402
Finished goods	4,855		5,024
Inventory balance at end of period	$	32,035	$	22,283
Current portion	$	31,123	$	20,850
Non-Current portion	$	912	$	1,433

The non-current inventory balance of $0.9 million and $1.4 million as of June 30, 2019 and September 30, 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 three and nine months ended June 30, 2019, we recorded a $0.2 million and $0.7 million reserve, respectively, on non-current inventory due to the decline in sales and future demand of the inventory. During the three and nine months ended June 30, 2018, we recorded a $0.5 million write-down on non-current inventory due to the decline in sales and future demand of the inventory.