The Company monitors the recoverability of goodwill annually or whenever events or changes in circumstances indicate the carrying value may not be recoverable. Purchased intangible assets subject to amortization consist of acquired technology and other intangible assets that include trade names, customer relationships and developed intellectual property (IP) processes.

Acquired technology consists of acquired license rights for patents and know-how obtained from PD-LD, Inc., Motorola, BASF SE (BASF) and Fujifilm. These intangible assets consist of the following (in thousands):


	September 30, 2021			December 31, 2020
PD-LD, Inc.	$	1,481		$	1,481
Motorola		15,909			15,909
BASF		95,989			95,989
Fujifilm		109,462			109,462
Other		462			462
		223,303			223,303
Less: Accumulated amortization		(168,489	)		(153,050	)
Acquired technology, net	$	54,814		$	70,253

Amortization expense related to acquired technology was $5.1 million for both three-month periods ended September 30, 2021 and 2020, and $15.4 million for both nine-month periods ended September 30, 2021 and 2020. Amortization expense is included in amortization of acquired technology and other intangible assets expense line item on the Consolidated Statements of Income and is expected to be $5.1 million for the three months ending December 31, 2021, $15.8 million in the year ending December 31, 2022, $9.7 million in the year ending December 31, 2023, $9.6 million in the years ending December 31, 2024 and 2025 and $5.0 million in total thereafter.

On July 23, 2012, the Company entered into a Patent Sale Agreement with Fujifilm. Under the agreement, Fujifilm sold more than 1,200 OLED-related patents and patent applications in exchange for a cash payment of $105.0 million, plus costs incurred in connection with the purchase. The agreement contains customary representations and warranties and covenants, including respective covenants not to sue by both parties thereto. The agreement permitted the Company to assign all of its rights and obligations under the agreement to its affiliates, and the Company assigned, prior to the consummation of the transactions contemplated by the agreement, its rights and obligations to UDC Ireland, a wholly-owned subsidiary of the Company formed under the laws of the Republic of Ireland. The transactions contemplated by the agreement were consummated on July 26, 2012. The Company recorded the $105.0 million plus $4.5 million of purchase costs as acquired technology, which is being amortized over a period of 10 years.

On June 28, 2016, UDC Ireland entered into and consummated an IP Transfer Agreement with BASF. Under the IP Transfer Agreement, BASF sold to UDC Ireland all of its rights, title and interest to certain of its owned and co-owned intellectual property rights relating to the composition of, development, manufacture and use of OLED materials, including OLED lighting and display stack technology, as well as certain tangible assets. The intellectual property includes knowhow and more than 500 issued and pending patents in the area of phosphorescent materials and technologies. These assets were acquired in exchange for a cash payment of €86.8 million ($95.8 million). In addition, UDC Ireland also took on certain rights and obligations under three joint research and development agreements to which BASF was a party. The IP Transfer Agreement also contains customary representations, warranties and covenants of the parties. UDC Ireland recorded the payment of €86.8 million ($95.8 million) and acquisition costs incurred of $217,000 as acquired technology, which is being amortized over a period of 10 years.

As a result of the Adesis acquisition in June 2016, the Company recorded $16.8 million of other intangible assets, including $10.5 million assigned to customer relationships with a weighted average life of 11.5 years, $4.8 million of internally developed IP, processes and recipes with a weighted average life of 15 years, and $1.5 million assigned to trade name and trademarks with a weighted average life of 10 years.

At September 30, 2021, these other intangible assets consist of the following (in thousands):


	September 30, 2021
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Customer relationships	$	10,520	$	(4,743	)	$	5,777
Developed IP, processes and recipes		4,820		(1,668	)		3,152
Trade name/Trademarks		1,500		(780	)		720
Other		394		(15	)		379
Total identifiable other intangible assets	$	17,234	$	(7,206	)	$	10,028

Amortization expense related to other intangible assets was $358,000 and $348,000 for the three months ended September 30, 2021 and 2020, respectively, and $1.1 million and $1.0 million for the nine months ended September 30, 2021 and 2020, respectively. Amortization expense is included in amortization of acquired technology and other intangible assets expense line item on the Consolidated Statements of Income and is expected to be $358,000 for the three months ending December 31, 2021, $1.4 million for each of the next four fiscal years (2022 – 2025) and $4.0 million in total thereafter.