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Note 5. Goodwill and Intangible Assets (Notes)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
5. Goodwill and Intangible Assets

Goodwill

Goodwill for the modules business consisted of the following at December 31, 2024 and 2023 (in thousands):
December 31, 2023Acquisitions (Impairments)Foreign Currency Translation AdjustmentsDecember 31, 2024
Gross amount$423,052 $— $(1,352)$421,700 
Accumulated impairment losses(393,365)— — (393,365)
Total$29,687 $— $(1,352)$28,335 
December 31, 2022Acquisitions (Impairments)Foreign Currency Translation AdjustmentsDecember 31, 2023
Gross amount (1)$407,827 $14,952 $273 $423,052 
Accumulated impairment losses(393,365)— — (393,365)
Total$14,462 $14,952 $273 $29,687 
——————————
(1)See Note 3. “Business Acquisitions” to our consolidated financial statements for discussion of our business acquisitions.

We performed our annual impairment analysis in the fourth quarters of 2024 and 2023. ASC 350-20 allows companies to perform a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying value to determine whether it is necessary to perform a quantitative goodwill impairment test. Such qualitative assessment considers various factors, including macroeconomic conditions, industry and market considerations, cost factors, the overall financial performance of a reporting unit, and any other relevant events affecting our company or a reporting unit.
We performed a qualitative assessment for our modules business in each respective period and concluded that it was not more likely than not that the fair value of the modules business was less than its carrying amount. Accordingly, a quantitative goodwill impairment test for the modules business was not required in any period presented.

Intangible assets, net

The following tables summarize our intangible assets at December 31, 2024 and 2023 (in thousands):
December 31, 2024
 Gross AmountAccumulated AmortizationNet Amount
Developed technology$97,645 $(88,717)$8,928 
In-process research and development43,159 — 43,159 
Patents10,068 (7,501)2,567 
Total$150,872 $(96,218)$54,654 
December 31, 2023
 Gross AmountAccumulated AmortizationNet Amount
Developed technology$97,645 $(78,659)$18,986 
In-process research and development (1)43,159 — 43,159 
Patents9,438 (7,072)2,366 
Total$150,242 $(85,731)$64,511 
——————————
(1)See Note 3. “Business Acquisitions” to our consolidated financial statements for discussion of our business acquisitions.

Amortization of intangible assets was $10.5 million, $10.5 million, and $10.9 million for the years ended December 31, 2024, 2023, and 2022, respectively.

Estimated future amortization expense for our definite-lived intangible assets was as follows at December 31, 2024 (in thousands):
Amortization Expense
2025$4,079 
20262,696 
20272,596 
2028876 
2029493 
Thereafter755 
Total amortization expense$11,495