The following table summarizes the activity in the carrying value of goodwill by reporting unit for the year ended December 31, 2022 (in thousands):


	Ecommerce			Wholesale			TDA			Total
Balance as of December 31, 2021	$	152,876		$	1,720		$	4,221		$	158,817
Acquisition		42,886			—			—			42,886
Goodwill impairment charge		(195,762	)		(1,720	)		(4,221	)		(201,703	)
Balance as of December 31, 2022	$	—		$	—		$	—		$	—

As of March 31, 2022, a quantitative interim goodwill impairment assessment was performed over the Company's reporting units due to further sustained declines in the Company's and comparable companies' stock prices during the three months ended March 31, 2022.

The Company estimated the fair value of the Ecommerce, Wholesale, and TDA reporting units using the discounted cash flow method under the income approach. The significant assumptions used in the valuation include revenue growth rates, future gross profit margins and operating expenses used to calculate projected future cash flows, determination of the weighted average cost of capital, and future economic and market conditions. The terminal value is based on an exit revenue multiple which requires significant assumptions regarding the selection of appropriate multiples that consider relevant market trading data. The Company bases its estimates and assumptions on its knowledge of the automotive and ecommerce industries, recent performance, expectations of future performance and other assumptions the Company believe to be reasonable.

The Company determined that the estimated fair value of the Ecommerce, Wholesale, and TDA reporting units was less than their carrying amounts. The Company recorded a goodwill impairment charge of $201.7 million in the consolidated statements of operations for the year ended December 31, 2022.

Refer to Note 5 – Acquisition for more information related to the acquisition that occurred in the year ended December 31, 2022.

Intangible assets, net consisted of the following (in thousands):


	December 31, 2023							December 31, 2022
	Gross Carrying Value		Accumulated Amortization			Carrying Value		Gross Carrying Value		Accumulated Amortization			Carrying Value
Developed and purchased technology	$	108,700	$	(38,050	)	$	70,650	$	108,700	$	(21,053	)	$	87,647
Customer relationships		69,400		(17,336	)		52,064		69,400		(8,661	)		60,739
Trademarks and trade names		12,200		(3,022	)		9,178		12,200		(1,676	)		10,524
Total intangible assets	$	190,300	$	(58,408	)	$	131,892	$	190,300	$	(31,390	)	$	158,910

Refer to Note 5 – Acquisition for more information related to the acquisition that occurred in the year ended December 31, 2022.

Amortization expense for intangible assets was $27.0 million and $25.3 million for the years ended December 31, 2023 and 2022, respectively.

The estimated amortization expense for intangible assets subsequent to December 31, 2023, consists of the following (in thousands):


Year Ending December 31:
2024	$	27,022
2025		27,022
2026		21,979
2027		21,882
2028		21,882
Thereafter		12,105
	$	131,892