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

Acacia’s only identifiable intangible assets at June 30, 2017 and December 31, 2016 are patents and patent rights.  Patent-related accumulated amortization totaled $369,129,000 and $358,043,000 as of June 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 June 30, 2017 (in thousands):
For the years ending December 31,
 
Remainder of 2017
$
11,248

2018
21,256

2019
19,150

2020
6,707

2021
5,421

Thereafter
11,451

 
$
75,233



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.