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Intangible Assets, Goodwill and Other
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The changes in the carrying amount of goodwill for the years ended December 31, 2023 and 2022 were as follows:
(in thousands)Dec. 31, 2021Goodwill acquired (impaired) during
2022		Foreign currency translation
adjustments during
2022		Dec. 31, 2022Goodwill acquired (impaired)
during 2023		Foreign currency translation
adjustments during
2023		 Dec. 31, 2023
United States$273,991 $— $— $273,991 $— $— $273,991 
Europe125,989 (118,008)(7,981)— — — — 
Japan630 (630)— — — — — 
Total goodwill$400,610 $(118,638)$(7,981)$273,991 $— $— $273,991 
On January 22, 2021, the Company acquired all of the outstanding shares of 3D Hubs, Inc. (Hubs), for $294.1 million, consisting of $127.4 million in cash and 863,995 shares of the Company's common stock valued at $166.7 million on the closing date. The fair value of the consideration paid for this acquisition had been allocated to the assets purchased and liabilities assumed based on their fair values as of the acquisition date, with any excess recorded as goodwill. The $280.9 million of goodwill associated with the acquisition represented both the strategic and growth opportunities by significantly expanding the customer offering with a network of premium manufacturing partners. The goodwill related to the acquisition is not deductible for tax purposes.
Goodwill decreased $126.6 million for the year ended December 31, 2022 as a result of impairments related to our Europe and Japan reporting units. The Euro denominated goodwill had been translated at the end of each period using the current exchange rates resulting in a foreign currency translation adjustment that was recorded as a component of Other Comprehensive Income.
Intangible assets other than goodwill for the years ended December 31, 2023 and 2022 were as follows:
Year Ended December 31, 2023Year Ended December 31, 2022Weighted Average
Useful Life
(in thousands)GrossAccumulated
Amortization		NetGrossAccumulated
Amortization		NetUseful Life (in
years)		Remaining (in years)
Marketing assets$930 $(900)$30 $930 $(806)$124 10.00.3
Non-compete agreement835 (603)232 828 (487)341 
2.0 - 5.0
1.4
Software technology13,229 (7,752)5,477 13,229 (6,383)6,846 10.04.0
Software platform26,373 (6,575)19,798 26,054 (4,337)21,717 12.09.1
Tradenames354 (347)7 350 (227)123 3.00.1
Customer relationships12,223 (12,183)40 12,197 (10,098)2,099 
3.0 - 9.0
0.1
Total intangible assets$53,944 $(28,360)$25,584 $53,588 $(22,338)$31,250  
Amortization expense for intangible assets for the years ended December 31, 2023, 2022 and 2021 was $5.9 million, $6.0 million and $6.2 million, respectively. The Euro denominated intangible assets are translated at the end of each period using the current exchange rates resulting in a foreign currency translation adjustment that is recorded as a component of Other Comprehensive Income. For the years ended December 31, 2023, 2022 and 2021 the foreign currency translation adjustment was $1.3 million, $1.7 million and $0.9 million, respectively.
Estimated aggregated amortization expense based on the current carrying value of the amortizable intangible assets is as follows:
(in thousands)Estimated Amortization
Expense
2024$3,741 
20253,660 
20263,558 
20273,549 
20282,180 
Thereafter8,896 
Total estimated amortization expense$25,584