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Goodwill and Other Intangible Assets
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
Goodwill
Prior to the STI Acquisition, goodwill, related to Former Parent’s acquisition of the Company, was recorded as $121.6 million and was subsequently impaired. Total accumulated impairment as of September 30, 2022 was $51.9 million.

The Company recorded an additional $335.4 million of goodwill as a result of the STI Acquisition and the Company’s reporting units became Array Legacy Operations and the newly acquired STI Operations, which had goodwill of $69.7 million and $289.9 million, respectively, at September 30, 2022 and $69.7 million and zero, respectively, at December 31, 2021. Goodwill is not deductible for tax purposes.

Changes in the carrying amount of goodwill by operating segment during the nine months ended September 30, 2022 are shown below (in thousands):
Array Legacy Operations Segment
STI Operations SegmentTotal
Beginning Balance
$69,727 $— $69,727 
Acquisition of STI
— 335,359 $335,359 
Foreign currency impact— (45,457)$(45,457)
Ending Balance
$69,727 $289,902 $359,629 

Each quarter the Company evaluates if facts and circumstances indicate that it is more-likely-than-not that the fair value of its reporting units is less than their carrying value, which would require the Company to perform an interim goodwill impairment test. During the quarter ended March 31, 2022, the Company determined it was necessary to perform an interim goodwill impairment test for the Array Legacy Operations reporting unit. The Company performed a quantitative goodwill impairment test and determined the estimated fair value of the reporting unit exceeded the carrying value assigned to that reporting unit; as a result, goodwill was not impaired.
Other Intangible Assets
Other intangible assets consisted of the following (in thousands, except useful lives):
Estimated Useful Lives (Years)September 30, 2022December 31, 2021
Amortizable:
Costs:
Developed technology14$203,800 $203,800 
Customer relationships10295,405 89,500 
Backlog144,132 — 
Trade name2024,518 — 
Total amortizable intangibles567,855 293,300 
Accumulated amortization:
Developed technology90,709 79,790 
Customer relationships70,606 49,057 
Backlog31,794 — 
Trade name962 — 
Total accumulated amortization194,071 128,847 
Total amortizable intangibles, net373,784 164,453 
Non-amortizable costs:
Trade name10,300 10,300 
Total other intangible assets, net$384,084 $174,753 

Amortization expense related to intangible assets amounted to $23.2 million and $5.9 million for the three months ended September 30, 2022 and 2021, respectively, and $69.8 million and $17.6 million for the nine months ended September 30, 2022 and 2021, respectively.

Estimated future annual amortization expense for the above amortizable intangible assets for the remaining periods through September 30, as follows (in thousands):
Amount
2022$22,365 
202346,633 
202445,328 
202545,328 
202641,021 
Thereafter173,109 
$373,784 
Long-lived assets, including intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable.

During the quarter ended March 31, 2022, the Company determined it was necessary to review long-lived assets, including intangible assets related to the Array Legacy Operations reporting unit, for impairment. The Company determined the undiscounted cash flows expected to result from the use of the asset group and its eventual disposition were greater than the carrying amount and therefore concluded there was no impairment.