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Intangible Assets and Goodwill
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
Intangible Assets and Goodwill

The following table sets forth the carrying amounts and accumulated amortization of the Company’s intangible assets:

 
As of March 31, 2016
 
As of December 31, 2015
 
Weighted Average
Useful Life
(years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization and Other Charges
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization and Other Charges
 
Net
Carrying
Amount
 
 
 
(in thousands)
Amortizable intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Product licenses(1)
15.5
 
$
24,500

 
$
(1,403
)
 
$
23,097

 
$
31,500

 
$
(7,869
)
 
$
23,631

Developed product rights(2)
16.3
 
372,560

 
(19,342
)
 
353,218

 
373,090

 
(14,121
)
 
358,969

Total amortizable intangible assets
16.2
 
397,060

 
(20,745
)
 
376,315

 
404,590

 
(21,990
)
 
382,600

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Intangible assets not subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
In-process research and development
 
$
253,620

 
$

 
$
253,620

 
$
253,620

 
$

 
$
253,620

Total intangible assets not subject to amortization:
 
253,620

 

 
253,620

 
253,620

 

 
253,620

Total intangible assets
 
$
650,680

 
$
(20,745
)
 
$
629,935

 
$
658,210

 
$
(21,990
)
 
$
636,220


_______________________________________
(1)
The Company amortizes intangible assets related to the product licenses over their expected useful lives.
(2)
The Company amortizes intangible assets related to developed product rights over the remaining life of the patents.

The Company recognized amortization expense of $6.3 million and $1.7 million related to its intangible assets in the three months ended March 31, 2016 and 2015, respectively. The Company expects amortization expense related to its intangible assets to be $18.9 million for the last nine months of 2016. The Company expects annual amortization expense related to its intangible assets to be $25.2 million, $24.8 million, $24.5 million, $24.4 million and $24.1 million for the years ending December 31, 2017, 2018, 2019, 2020 and 2021, respectively, with the balance of $234.4 million being amortized thereafter. The Company records amortization expense in cost of revenue in the accompanying condensed consolidated statements of operations.

There were no changes in the carrying amount of goodwill for the three months ended March 31, 2016.