The acquisition of Cloudvisory was accounted for in accordance with the acquisition method of accounting for business combinations with FireEye as the accounting acquirer. Under the acquisition method of accounting, the total purchase consideration is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values. The total purchase price of $13.2 million was allocated using the information available to us. The results of operations of Cloudvisory have been included in our consolidated statements of operations from the acquisition date, though revenue and net income from Cloudvisory were not material for the six months ended June 30, 2021. Transaction costs were immaterial and expensed as incurred. Pro forma financial information has not been presented for this acquisition as the impact to our consolidated financial statements was not material. Allocation of the purchase price is as follows (in thousands):

The purchase price exceeded the fair value of the net tangible liabilities and identifiable intangible assets acquired, resulting in the recognition of goodwill. Goodwill is primarily attributable to expected synergies in our subscription offerings and cross-selling opportunities. The goodwill generated as a result of the Cloudvisory acquisition is deductible for tax purposes.

Intangible assets consist primarily of developed technology and trade name. Intangible assets attributable to developed technology include a combination of patented and unpatented technology, trade secrets, computer software and research processes that represent the foundation for the existing and planned new products to facilitate the generation of new content. Trade name is attributable to marketing goods and services under the Cloudvisory brand.

The value of developed technology was estimated using the excess earnings method, an income approach (Level 3), which converts projected revenues and costs into cash flows. To reflect the fact that certain other assets contribute to the cash flows generated, the returns for these contributory assets were removed to arrive at estimated cash flows solely attributable to the acquired technology, which were discounted at a rate of 35% to determine the fair value.

The value of the trade name was estimated using the relief-from-royalty method, an income approach (Level 3), which estimates the cost savings that accrue to the owner of the intangibles asset that would otherwise be payable as royalties or license fees on revenues earned through the use of the asset. A royalty rate of 1% was applied to the projected revenues associated with the intangible asset to determine the amount of savings using a discount rate of 35% to determine the fair value.

Discount rates for each respective intangible asset were determined by accounting for the risk associated with each asset, including required technology development necessary to support respective projections, the uncertainty of market success and the risk inherent with projected financial results. The estimated useful lives were determined by evaluating the expected economic and useful lives of the assets and of similar intangible assets from previous business combinations and adjusting accordingly for circumstances that may be unique to Cloudvisory.

The intangibles acquired and net tangible liability assumed in this acquisition are reported as held for sale. Goodwill generated by the Cloudvisory acquisition amounted to $1.8 million and was allocated to the Products business based on relative fair value and is reported as held for sale.

In November 2020, we acquired all outstanding shares of privately held Respond Software, a cybersecurity investigation automation company. The acquisition of Respond Software, a leader in automation of extended detection and response (XDR), is intended to add significant capabilities to our Mandiant Advantage platform by automating threat detection and reducing the amount of analyst time necessary to investigate threats due to the reduction in false positives as well as to accelerate Respond Software's learning models with our unique expertise and threat intelligence. In connection with this acquisition, we paid cash consideration of $116.1 million and issued 4,931,862 shares of our common stock, 694,768 of these shares were subject to vesting conditions as of December 31, 2020, of which 257,852 were canceled during the three months ended March 31, 2021 and 436,916 shares remained subject to vesting conditions as of June 30, 2021. The estimated fair value of the common stock issued and not subject to vesting conditions was $60.3 million. We also assumed unvested stock options, which are now exercisable for our common stock, of which $1.2 million of the fair value has been accounted for as consideration for assumed awards pertaining to pre-combination service prior to acquisition. Based on the above, total purchase consideration for Respond Software was $177.6 million.

The acquisition of Respond Software was accounted for in accordance with the acquisition method of accounting for business combinations with FireEye as the accounting acquirer. Under the acquisition method of accounting, the total purchase consideration is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values. The total purchase price of $177.6 million was allocated using the information available to us. As a result, we may continue to adjust the preliminary purchase price allocation after obtaining more information regarding asset valuations, liabilities assumed, and revisions of

preliminary estimates. The results of operations of Respond Software have been included in our consolidated statements of operations from the acquisition date, and revenue and net income from Respond Software were not material for the year ended December 31, 2020. Transaction costs were immaterial and expensed as incurred. Pro forma financial information has not been presented for this acquisition as the impact to our consolidated financial statements was not material. Allocation of the preliminary purchase price is as follows (in thousands):

The preliminary purchase price exceeded the fair value of the net tangible liabilities and identifiable intangible assets acquired, resulting in the recognition of goodwill. Goodwill is primarily attributable to expected synergies in our subscription offerings and cross-selling opportunities. The goodwill is not expected to be deductible for U.S. income tax purposes.

Intangible assets consist primarily of developed technology, in-process technology, customer relationships and trade name. Intangible assets attributable to developed technology include a combination of patented and unpatented technology, trade secrets, computer software and research processes that represent the foundation for the existing and planned new products to facilitate the generation of new content. Customer relationship intangibles relate to Respond Software's ability to sell current and future content, as well as products built around this content, to its existing customers. Trade name is attributable to marketing goods and services under the Respond Software brand.

The value of in-process technology was estimated using the excess earnings method, an income approach (Level 3), which converts projected revenues and costs into cash flows. To reflect the fact that certain other assets contribute to the cash flows generated, the returns for these contributory assets were removed to arrive at estimated cash flows solely attributable to the acquired technology, which were discounted at a rate of 13% to determine the fair value.

The value of customer relationships was estimated using the "with and without" version of the Income Approach, which measures the difference between cash flows generated assuming the existence of the current customer relationships and the cash flows assuming those relationships do not exist and are replaced over time. Estimated costs on projected revenues, excluding acquired contract backlog, were made using historical data pertaining to sales to new and existing customers. The cash flow impact of projected cost savings, primarily avoidance of legal costs pertaining to new customers and lower commission rates applicable to existing customers than new customers, were discounted at a rate of 11% to determine the fair value.

Goodwill and purchased intangible assets held for sale pursuant to our agreement to sell the FireEye Products business to STG were included in assets held for sale in our condensed consolidated balance sheets as of June 30, 2021 and December 31, 2020, and accordingly, are excluded from the amounts shown in the tables below.


	As of June 30, 2021		As of December 31, 2020
Developed technology	$	147,493	$	147,493
Content	158,700		158,700
Customer relationships	112,360		112,360
Contract backlog	13,200		13,200
Trade names	17,720		17,720
Non-competition agreements	1,100		1,100
Total intangible assets	450,573		450,573
Less: accumulated amortization	(352,126)		(330,018)
Total net intangible assets	$	98,447	$	120,555

Amortization expense of intangible assets during the three months ended June 30, 2021 and 2020 was $11.0 million and $10.0 million, respectively. Amortization expense of intangible assets during the six months ended June 30, 2021 and 2020 was $22.1 million and $20.4 million, respectively.