Intangible Assets

6 Months Ended

Jun. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

(5) Intangible Assets

At June 30, 2023 and December 31, 2022, the Company's intangible assets with finite lives were as follows:


	June 30, 2023						December 31, 2022
(in thousands)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Intangible assets with finite lives:
Customer relationships	$	51,939	$	(50,180)	$	1,759	$	51,137	$	(48,695)	$	2,442
Acquired technology	55,931		(14,059)		41,872		55,480		(10,707)		44,773
Trade names	36,210		(13,965)		22,245		35,930		(12,455)		23,475
Patent costs	18,822		(11,040)		7,782		18,673		(10,909)		7,764

Acquired patents	17,526		(15,797)		1,729		17,499		(15,661)		1,838
Other	13,331		(9,129)		4,202		13,255		(8,765)		4,490
Total intangible assets	$	193,759	$	(114,170)	$	79,589	$	191,974	$	(107,192)	$	84,782

The Company’s total intangible assets reported on the balance sheet include an indefinite-life intangible asset related to dp polar in-process research and development (“IPR&D”). The carrying value of this indefinite-life intangible asset was $5,541 and $5,448 as of June 30, 2023 and December 31, 2022.

Amortization expense related to intangible assets was $3,258 and $6,497 for the three and six months ended June 30, 2023, respectively, compared to $3,303 and $5,980 for the three and six months ended June 30, 2022, respectively. Amortization expense for intangible assets is estimated to be $4,665 for the remainder of 2023, $11,133 in 2024, $11,058 in 2025, $8,399 in 2026 and $7,317 in 2027.