For the three months ended March 31, 2020, our stock price was impacted by volatility in the U.S. financial markets as a result of the rapid spread of the coronavirus globally which has resulted in increased travel restrictions and disruption and shutdown of businesses, and traded below the then book value for an extended period of time. As a result, the Company performed an interim impairment test of our long-lived intangible assets using an undiscounted cash flow analysis pursuant to ASC 360, Property, Plant, and Equipment and determined there was impairment.

Based on the results of the test, the Company recorded pre-tax non-cash impairment totaling $5.0 million in the first quarter of 2020 relating to customer relationships, technologies, non-compete agreements and tradenames. These charges are reflected in the Company’s Consolidated Statement of Operations for the year ended December 31, 2020 within Impairment of intangible assets from acquisitions.

	As of December 31, 2020
(In Thousands)	Gross Carrying Amount		Accumulated Amortization			Impairment			Net Carrying Amount
Customer relationships	$	13,018	$	(4,693	)	$	(3,430	)	$	4,895
Technologies		9,369		(4,731	)		(1,062	)		3,576
Non-compete agreements		3,409		(2,413	)		(346	)		650
Tradenames		734		(538	)		(121	)		75
Total identifiable intangible assets from acquisitions	$	26,530	$	(12,375	)	$	(4,959	)	$	9,196

	As of December 31, 2021
(In Thousands)	Gross Carrying Amount		Accumulated Amortization			Impairment			Net Carrying Amount
Customer relationships	$	13,018	$	(6,679	)	$	(3,430	)	$	2,909
Technologies		9,369		(6,905	)		(1,062	)		1,402
Non-compete agreements		3,409		(2,660	)		(346	)		403
Tradenames		734		(613	)		(121	)		0
Total identifiable intangible assets from acquisitions	$	26,530	$	(16,857	)	$	(4,959	)	$	4,714

Amortizable intangible assets are amortized on a straight-line basis over their useful lives. Customer relationships, acquired technologies, tradenames, and non-compete agreements have a weighted average useful life from date of purchase of 5 years, 3-5 years, 2 years, 1 - 3 years, respectively. Aggregate amortization expense incurred by the Company for the year ended December 31, 2020 and 2021 was approximately $5.3 million and $4.5 million, respectively. Based upon the current amount of acquired identifiable intangible assets subject to amortization, the estimated amortization expense is as follows: $2.1 million in 2022, $2.0 million in 2023, and $602,000 in 2024.