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Patents
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets
PATENTS

Acacia’s only identifiable intangible assets at September 30, 2018 and December 31, 2017 are patents and patent rights. Patent-related accumulated amortization totaled $425,990,000 and $382,220,000 as of September 30, 2018 and December 31, 2017, respectively. Acacia’s patents have remaining estimated economic useful lives ranging from one to five years. The weighted-average remaining estimated economic useful life of Acacia’s patents is approximately two years.  

The following table presents the scheduled annual aggregate amortization expense as of September 30, 2018 (in thousands):
For the years ending December 31,
 
Remainder of 2018
$
3,215

2019
10,876

2020
1,682

2021
822

2022
817

Thereafter
735

 
$
18,147



Acacia recorded impairment of patent-related intangible asset charges of $28,210,000. The impairment charges were realized in the period due to a reduction in expected estimated future net cash flows for certain patents due to second quarter 2018 developments in the ongoing litigation. The impairment charges consisted of the excess of the asset’s carrying value over its estimated fair value as of June 30, 2018. Assumptions utilized in the cash flow analysis included margins on estimated net proceeds ranging from 53% to 86% and a discount for the time value of money of zero percent, due to the relatively short time-frame associated with estimated cash flows.