3. Balance Sheet Components

Inventories

Inventories as of February 28, 2018 and August 31, 2017 consisted of the following (in thousands):

	February 28,		August 31,
	2018		2017
Raw materials	$	808	$	885
Work in process		609		758
Finished goods		994		1,303
Total	$	2,411	$	2,946

Inventory write-downs to estimated net realizable values were $207 thousand and $413 thousand for the three and six months ended February 28, 2018, respectively, and $334 thousand and $530 thousand for the three and six months ended February 28, 2017, respectively.

Property, Plant and Equipment

Property, plant and equipment as of February 28, 2018 and August 31, 2017 consisted of the following (in thousands):

	February 28,			August 31,
	2018			2017
Buildings and improvements	$	14,369		$	13,891
Machinery and equipment		42,361			42,562
Leasehold improvements		246			238
Other equipment		2,388			2,311
Construction in progress		323			321
Total property, plant and equipment		59,687			59,323
Less: Accumulated depreciation and amortization		(51,736	)		(51,048	)
Property, plant and equipment, net	$	7,951		$	8,275

Intangible Assets

Intangible assets as of February 28, 2018 and August 31, 2017 consisted of the following (in thousands):

	February 28, 2018
	Weighted
	Average		Gross				Net
	Amortization		Carrying		Accumulated		Carrying
	Period (Years)		Amount		Amortization		Amount
Patents and trademarks		15	$	570	$	461	$	109
Acquired technology		5		520		520		—
Total			$	1,090	$	981	$	109

	August 31, 2017
	Weighted
	Average		Gross				Net
	Amortization		Carrying		Accumulated		Carrying
	Period (Years)		Amount		Amortization		Amount
Patents and trademarks		15	$	574	$	470	$	104
Acquired technology		5		503		503		—
Total			$	1,077	$	973	$	104

The Company sold 4 patents on October 25, 2017 for a total of $500 thousand.