INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

As of June 30, 2016, the net book value of amortizable intangible assets was approximately $184.4 million.

The following table sets forth amortizable intangible assets as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016			December 31, 2015
Finite-lived intangible assets	$	209,787		$	179,096
Less: accumulated amortization	(25,355		)	(17,560		)
Net carrying value	$	184,432		$	161,536

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Research and development	$	81	$	193	$	163	$	414
Selling, general and administrative	3,829		3,614		7,632		5,128
Total amortization expense	$	3,910	$	3,807	$	7,795	$	5,542