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GOODWILL AND OTHER INTANGIBLE ASSETS, NET
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS, NET
Changes in the carrying amount of goodwill consisted of the following:
Year Ended December 31,
2021
(In thousands)
Beginning balance$— 
Acquisition of business7,470 
Impairment losses— 
Ending balance$7,470 
The ending balance of goodwill includes no accumulated impairment losses to date. Refer to Note 3 for additional information related to the Printronix acquisition.
Other intangible assets, net consisted of the following:
December 31, 2021
Weighted Average Amortization PeriodGross Carrying AmountAccumulated AmortizationNet Book Value
(In thousands)
Patents:
Intellectual property operations6 years$331,403 $(294,341)$37,062 
Industrial operations7 years3,400 (112)3,288 
Total patents334,803 (294,453)40,350 
Customer relationships - industrial operations7 years5,300 (174)5,126 
Trade name and trademarks - industrial operations7 years3,430 (113)3,317 
Total$343,533 $(294,740)$48,793 
December 31, 2020
Weighted Average Amortization PeriodGross Carrying AmountAccumulated AmortizationNet Book Value
(In thousands)
Patents:
Intellectual property operations7 years$336,834 $(319,922)$16,912 
Total patents$336,834 $(319,922)$16,912 
Total intangible asset amortization expense in the consolidated statements of operations was $10.3 million and $4.7 million for the years ended December 31, 2021 and 2020, respectively. The Company did not record charges related to the impairment of intangible assets for the years ended December 31, 2021 and 2020. There was approximately $152,000 in accelerated amortization of intangible assets for the year ended December 31, 2021 and none in 2020. During 2021, Acacia reduced its gross patent costs and accumulated amortization by approximately $35.0 million for patents that were fully amortized. Intellectual Property Operations amortization of patents is expensed in cost of revenues and Industrial Operations amortization, for the period from October 7, 2021 through December 31, 2021, is expensed in general and administrative expenses.
The following table presents the scheduled annual aggregate amortization expense (in thousands):
Years Ending December 31,
2022$12,136 
202312,068 
202410,692 
20258,348 
20262,483 
Thereafter3,066 
Total$48,793 
During the year ended December 31, 2021, Acacia accrued certain patent and patent rights acquisition costs, of which $5.0 million is due February 18, 2023. Such amount is included in other long-term liabilities in the consolidated balance sheet as of December 31, 2021.