Property, Plant, and Equipment, net

12 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

The components of property, plant, and equipment, net consisted of the following:


	As of September 30,
(in thousands)	2021		2020
Equipment	$	37,985	$	35,218
Furniture and fixtures	1,125		1,125
Computer hardware and software	3,575		3,473
Leasehold improvements	6,663		3,169
Construction in progress	9,247		10,301
Property, plant, and equipment, gross	$	58,595	$	53,286
Accumulated depreciation	(36,051)		(32,234)
Property, plant, and equipment, net	$	22,544	$	21,052

Depreciation expense totaled $4.0 million, $5.5 million and $7.1 million during the fiscal years ended September 30, 2021, 2020 and 2019, respectively. During the fiscal year ended September 30, 2021 and 2020 the Company sold certain equipment and recognized a (loss) gain on sale of assets of $(0.5) million and $2.3 million, respectively. In addition, in the fiscal year ended September 30, 2020, the Company entered into agreements to sell additional equipment and these assets were reclassified to assets held for sale. The balance as of September 30, 2021 and 2020 was $1.2 million and $1.6 million, respectively.

In February 2020, SDI sold its property located in Concord, California (the "Concord Real Property") to Eagle Rock Holdings, LP ("Eagle Rock"), an affiliate of Parkview Management Group, Inc., for a total purchase price of $13.2 million. The Company received net proceeds of $12.8 million after reducing for transaction commissions and expenses incurred in connection with the sale. The Company recorded a gain on the sale of assets of approximately $0.3 million in the fiscal year ended September 30, 2020 related to this transaction. At the consummation of the sale of the Concord Real Property, SDI entered into a Single-Tenant Triple Net Lease (the “Concord Lease Agreement”) pursuant to which SDI leased back from Eagle Rock the Concord Real Property for a term commencing in February 2020 and ending February 2035, unless earlier terminated or extended in accordance with the terms of the Lease Agreement. As a result of the Concord Lease Agreement, the Company recorded net operating lease ROU assets and operating lease liabilities of $10.8 million during the fiscal year ended September 30, 2020.

Geographical Concentrations

Long-lived assets consist of land, building, and property, plant, and equipment. As of September 30, 2021 and 2020, approximately 96% and 97%, respectively, of long-lived assets were located in the United States. The remaining long-lived assets are primarily located in China.