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INTANGIBLE ASSETS
9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS
INTANGIBLE ASSETS
As of September 30, 2016, the net book value of amortizable intangible assets was approximately $183.3 million.
The following table sets forth amortizable intangible assets as of September 30, 2016 and December 31, 2015 (in thousands):

September 30, 2016
 
December 31, 2015
Finite-lived intangible assets
$
212,722

 
$
179,096

Less: accumulated amortization
(29,424
)
 
(17,560
)
Net carrying value
$
183,298

 
$
161,536


The following table summarizes amortization expense for the three and nine months ended September 30, 2016 and 2015 (in thousands):

Three Months Ended September 30,
 
Nine Months Ended September 30,

2016
 
2015
 
2016
 
2015
Research and development
$
82

 
$
200

 
$
245

 
$
614

Selling, general and administrative
3,987

 
3,675

 
11,619

 
8,803

Total amortization expense
$
4,069

 
$
3,875

 
$
11,864

 
$
9,417