Intangible assets subject to amortization that are not fully amortized are as follows (in thousands except years):


	Weighted average useful life	As of September 30, 2024						As of December 31, 2023
		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	3.1	$	10,400	$	(3,986)	$	6,414	$	10,400	$	(2,427)	$	7,973
Reacquired rights	5.1	17,618		(4,824)		12,794		17,618		(2,936)		14,682
Backlog	0.1	6,700		(6,421)		279		6,700		(3,908)		2,792
Other	0.0	4,225		(4,225)		—		4,225		(3,770)		455
Total intangible assets		$	38,943	$	(19,456)	$	19,487	$	38,943	$	(13,041)	$	25,902

Amortization expense of intangible assets was not material for the three and nine months ended September 30, 2024 or 2023.

As of September 30, 2024, expected amortization expense for the unamortized finite-lived intangible assets is as follows (in thousands):