In February 2022, we acquired Cymptom, a platform that proactively measures, maps and prioritizes probable attack paths, and enables security teams to preemptively focus response ahead of and during breaches. Through a share purchase agreement, we acquired 100% of Cymptom's equity in exchange for cash consideration, net of cash acquired, for $23.0 million.

Cash consideration, net of cash acquired, was preliminarily allocated as follows:


(in thousands)


Intangible assets	$	4,113
Goodwill	18,960


Other liabilities, net	(113)
Total purchase price	$	22,960

We are still finalizing the allocation of the purchase price, which may change as additional information becomes available related to acquired intangible assets and income taxes.

Acquired intangible assets and their estimated useful lives at the date of acquisition are as follows:


	Intangible Assets
(dollars in thousands)	Cost		Estimated Useful Life
Acquired technology	$	4,113	7 years

Acquired intangible assets	$	4,113

The results of operations of Cymptom are included in our consolidated statements of operations from the acquisition date and were not material. Pro forma results of operations are not presented as they are not material to the consolidated statements of operations.

In general and administrative expense, we recognized $1.3 million and $2.2 million of acquisition-related transaction costs in the three months ended March 31, 2022 and 2021, respectively.

The changes in the carrying amount of goodwill are as follows:


(in thousands)
Balance at December 31, 2021	$	261,614
Acquired goodwill	18,960
Balance at March 31, 2022	$	280,574

The excess purchase consideration over the fair value of acquired assets and liabilities is recorded as goodwill. The acquired goodwill reflects the synergies we expect from marketing and selling new capabilities from Cymptom to our customers. The acquired goodwill is not tax deductible.


	March 31, 2022						December 31, 2021
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Acquired technology	$	86,037	$	(12,890)	$	73,147	$	81,924	$	(10,499)	$	71,425
Trade name	390		(316)		74		390		(279)		111
	$	86,427	$	(13,206)	$	73,221	$	82,314	$	(10,778)	$	71,536

Amortization of acquired intangible assets was $2.4 million and $0.6 million in the three months ended March 31, 2022 and 2021, respectively. At March 31, 2022, our acquired intangible assets are expected to be amortized over an estimated weighted average period of 7.4 years.

At March 31, 2022, estimated future amortization of acquired intangible assets is as follows:


(in thousands)
Year ending December 31,
2022(1)	$	7,993
2023	10,637
2024	10,603
2025	10,603
2026	10,419
Thereafter	22,966
Total	$	73,221