8. Inventories

Inventories consisted of the following (in thousands):

	AS OF SEPTEMBER 30,
	2018			2017
Finished goods	$	18,802		$	33,690
Work in process		7,926			2,512
Raw material		54,290			70,099
Obsolescence reserve		(30,551	)		(29,614	)
		50,467			76,687
Less current portion		18,812			20,752
Non-current portion	$	31,655		$	55,935

Inventory obsolescence expense totaled approximately $4.4 million, $21.5 million and $11.2 million during fiscal years 2018, 2017 and 2016, respectively. Raw materials include semi-finished goods and component parts which totaled approximately $29.0 million and $43.2 million at September 30, 2018 and 2017, respectively.