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Patents
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets
PATENTS

Acacia’s only identifiable intangible assets at September 30, 2017 and December 31, 2016 are patents and patent rights.  Patent-related accumulated amortization totaled $376,777,000 and $358,043,000 as of September 30, 2017 and December 31, 2016, respectively.

Acacia’s patents have remaining estimated economic useful lives ranging from one to seven years.  The weighted-average remaining estimated economic useful life of Acacia’s patents is approximately four years.  The following table presents the scheduled annual aggregate amortization expense as of September 30, 2017 (in thousands):
For the years ending December 31,
 
Remainder of 2017
$
5,443

2018
20,542

2019
18,527

2020
6,134

2021
5,261

Thereafter
11,453

 
$
67,360



Acacia recorded impairment of patent-related intangible asset charges of $2,248,000 and $40,165,000 for the nine months ended September 30, 2017 and 2016, respectively. Impairment charges for the nine months ended September 30, 2017 primarily reflect reductions in expected estimated future net cash flows for certain patent portfolios that management determined it would no longer allocate resources to in future periods. Impairment charges for the nine months ended September 30, 2016 were primarily comprised of the write-off of the remaining carrying value of the Adaptix portfolio due to a reduction in expected estimated future net cash flows, and the write-off of certain patent portfolios that management determined it would no longer allocate future resources to in future periods. The impairment charges consisted of the excess of the asset’s carrying value over its estimated fair value.