Note 4. Goodwill and Intangible Assets (Notes)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

4. Goodwill and Intangible Assets

Goodwill

Goodwill for the modules business consisted of the following at December 31, 2022 and 2021 (in thousands):

	December 31, 2021		Acquisitions (Impairments)		December 31, 2022
Gross amount	$	407,827	$	—	$	407,827
Accumulated impairment losses	(393,365)		—		(393,365)
Total	$	14,462	$	—	$	14,462

	December 31, 2020		Acquisitions (Impairments)		December 31, 2021
Gross amount	$	407,827	$	—	$	407,827
Accumulated impairment losses	(393,365)		—		(393,365)
Total	$	14,462	$	—	$	14,462

We performed our annual impairment analysis in the fourth quarters of 2022, 2021, and 2020. 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, 2022 and 2021 (in thousands):

	December 31, 2022
	Gross Amount		Accumulated Amortization		Net Amount
Developed technology	$	97,347	$	(68,650)	$	28,697
Patents	8,970		(6,561)		2,409
Total	$	106,317	$	(75,211)	$	31,106

	December 31, 2021
	Gross Amount		Accumulated Amortization		Net Amount
Developed technology	$	99,964	$	(61,985)	$	37,979
Power purchase agreements	6,486		(1,621)		4,865
Patents	8,480		(5,815)		2,665
Total	$	114,930	$	(69,421)	$	45,509

Amortization of intangible assets was $10.9 million, $10.9 million, and $10.8 million for the years ended December 31, 2022, 2021, and 2020, respectively.

Estimated future amortization expense for our definite-lived intangible assets was as follows at December 31, 2022 (in thousands):

	Amortization Expense
2023	$	10,510
2024	10,380
2025	3,910
2026	2,526
2027	2,426
Thereafter	1,354
Total amortization expense	$	31,106