Major classes of fixed assets consisted of the following:


	Useful Lives	June 30, 2026			December 31, 2025
		(in thousands)
Medical lab equipment	5 months to 13 Years	$	64,343		$	60,691
Building improvements	6 months to 39 Years		35,620			33,198
Building	25 to 39 Years		21,689			21,689
Computer hardware	1 to 5 Years		9,836			8,640
Aircraft	7 Years		6,400			6,400
Computer software	1 to 10 Years		6,357			6,300
Leasehold improvements	Shorter of lease term or estimated useful life		4,503			4,473
Furniture and fixtures	1 to 11 Years		4,452			4,128
Land improvements	5 to 15 Years		938			938
Automobile	3 to 7 Years		613			628
General equipment	5 Years		258			226
Land			17,347			17,347
Assets not yet placed in service			5,007			5,836
Total			177,363			170,494
Less: Accumulated depreciation			(64,295	)		(57,945	)
Fixed assets, net		$	113,068		$	112,549

Depreciation expense on fixed assets totaled $5.0 million and $8.9 million for the three and six months ended June 30, 2026, respectively, and $3.9 million and $7.7 million for the three and six months ended June 30, 2025, respectively.