Property and equipment, net consisted of the following (in thousands):


	As of December 31,
	2022			2021
Laboratory equipment	$	679		$	2,659
Software and computer equipment		407			548
Machinery and equipment		450			1,809
Furniture and fixtures		83			211
Vehicles		306			417
Leasehold improvements		1,590			2,306
Property and equipment, gross		3,515			7,950
Less accumulated depreciation and amortization		(2,811	)		(5,659	)
Property and equipment, net	$	704		$	2,291

Depreciation expense was $439,000 and $929,000 for the years ended December 31, 2022 and 2021, respectively.

As of December 31, 2022 and 2021, there was $10,000 and $267,000 of construction in progress, respectively, included in property and equipment that had not been placed into service and was not subject to depreciation.

Property and equipment are considered assets held for sale when management approves and commits to a plan to dispose of a property or group of properties. The property and equipment held for sale prior to the sale date is separately presented, within current assets, on the consolidated balance sheet as assets held for sale.

During the year ended December 31, 2022, management initiated the sale of property and equipment related to the Davis laboratory, Archipelago and Body Care. The Company completed the sale of such property and equipment with a net gain on sale of property and equipment in the amount of $314,000 recorded on the consolidated statements of operations and comprehensive loss during the year ended December 31, 2022. The proceeds related to the sale of property and equipment during the year ended December 31, 2022 were $920,000. The Company had no sales of assets held for sale as of December 31, 2021. Property and equipment related to Archipelago, in the amount of $87,000, have been classified as assets held for sale, and are recorded at fair value as of December 31, 2022.

During the year ended December 31, 2022, the Company recorded write-downs of property and equipment of $530,000, of which $320,000 was related to the Radiance Beauty licensing agreement. See Note 7 for further discussion of the licensing agreement. The Company recorded impairments of property and equipment in the amount of $1.5 million for the year ended December 31, 2021 primarily related to the unwinding of Archipelago. The Company assessed Archipelago’s fixed assets for impairment through an asset recoverability test, calculating the fair value using prices for similar assets.