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Goodwill and Intangible Assets, net
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, net Goodwill and Intangible Assets, net
The goodwill and intangible assets were acquired as part of the acquisition of Mainstream Energy Corporation, which included AEE Solar and its racking business SnapNrack; Clean Energy Experts, LLC; Omni Energy, LLC; and Vivint Solar.
The change in the carrying value of goodwill is as follows (in thousands):
Balance—January 1, 2019$87,543 
Acquisition of Omni (Note 3)7,551 
Balance—December 31, 201995,094 
Acquisition of Vivint Solar (Note 3)4,185,075 
Balance—December 31, 2020 and 2021$4,280,169 
The Company performs its annual impairment test of goodwill on October 1 of each fiscal year or whenever events or circumstances change or occur that would indicate that goodwill might be impaired. As of October 1, 2021, the Company conducted its annual goodwill impairment test, based on a qualitative assessment. The test concluded that no impairment had occurred. Since December 31, 2021, the price of the Company’s common stock has declined. A sustained decrease in the price of the Company’s common stock is one of the qualitative factors to be considered as part of an impairment test when evaluating whether events or changes in circumstances may indicate that it is more likely than not that a potential goodwill impairment exists. The Company will continue monitoring the analysis of the qualitative and quantitative factors used as a basis for the goodwill impairment test during fiscal year 2022.

The Company has determined that it has one reporting unit.
There was no impairment of goodwill during the years ended December 31, 2021, 2020 and 2019, respectively.
Intangible assets, net as of December 31, 2021 consist of the following (in thousands, except weighted average remaining life):
Cost
Accumulated
amortization
Carrying
value
Weighted
average
remaining life
(in years)
Customer relationships$32,770 $(20,346)$12,424 2.7
Developed technology6,820 (6,820)— — 
Trade names6,990 (6,523)467 1.3
Total
$46,580 $(33,689)$12,891 
Intangible assets, net as of December 31, 2020 consist of the following (in thousands, except weighted average remaining life):
Cost
Accumulated
amortization
Carrying
value
Weighted
average
remaining life
(in years)
Customer relationships
$32,770 $(15,349)$17,421 3.6
Developed technology
6,820 (6,820)— — 
Trade names
6,990 (6,149)841 2.3
Total
$46,580 $(28,318)$18,262 
The Company recorded amortization of intangible assets expense of $5.4 million, $5.2 million and $4.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. As of December 31, 2021, expected amortization of intangible assets for each of the five succeeding fiscal years and thereafter is as follows (in thousands):
2022$5,364 
20234,673 
20242,269 
2025585 
2026— 
Thereafter
— 
Total
$12,891