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Patents
6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Identifiable Intangible Assets
PATENTS

Acacia’s only identifiable intangible assets at June 30, 2016 and December 31, 2015 are patents and patent rights.  Patent-related accumulated amortization totaled $343,179,000 and $281,495,000 as of June 30, 2016 and December 31, 2015, respectively.

Acacia’s patents have remaining estimated economic useful lives ranging from one to eight years.  The weighted-average remaining estimated economic useful life of Acacia’s patents is approximately five years.  The following table presents the scheduled annual aggregate amortization expense as of June 30, 2016 (in thousands):
For the years ending December 31,
 
Remainder of 2016
$
12,464

2017
23,312

2018
22,111

2019
19,412

2020
6,787

Thereafter
16,872

 
$
100,958



For the six months ended June 30, 2016 and 2015, Acacia paid patent related investment costs, including up-front patent portfolio advances and previously accrued milestone payments related to patent related investments made in prior periods, totaling $1,000,000 and $18,667,000, respectively.  The underlying patents have estimated economic useful lives of approximately four to nine years.

Acacia recorded impairment of patent-related intangible asset charges of $40,165,000 for the six months ended June 30, 2016, primarily comprised of the write-off of the remaining carrying value of our Adaptix portfolio. The impairment charges were realized in the period due to a reduction in expected estimated future net cash flows and certain patent portfolios that management determined it would no longer allocate future resources to in connection with the licensing and enforcement of such portfolios, due primarily to the overall determination that future resources would be allocated to other licensing and enforcement programs. The impairment charges consisted of the excess of the asset’s carrying value over its estimated fair value.