INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2015

INTANGIBLE ASSETS

Summary of the gross carrying amounts and net book values of our intangible assets

The gross carrying amounts and net book values of our intangible assets were as follows (in thousands):

	June 30, 2015					December 31, 2014
Amounts in thousands	Remaining Useful Life (In years)	Gross Carrying Amount	Accumulated Amortization		Net Book Value	Gross Carrying Amount	Accumulated Amortization		Net Book Value
NUCYNTA product rights	10.0	1,019,489	(24,325	)	995,164	—	—		—
CAMBIA product rights	8.5	51,360	(7,915	)	43,445	51,360	(5,347	)	46,013
Lazanda product rights	7.0	10,480	(2,232	)	8,248	10,480	(1,650	)	8,830
Zipsor product rights	6.8	27,250	(11,528	)	15,722	27,250	(9,732	)	17,518
		1,108,579	(46,000	)	1,062,579	89,090	(16,729	)	72,361

Summary of the future amortization expenses of intangible assets

Based on finite-lived intangible assets recorded as of June 30, 2015, and assuming the underlying assets will not be impaired and that the Company will not change the expected lives of the assets, future amortization expenses were estimated as follows (in thousands):

Year Ending December 31,	Estimated Amortization Expense
2015 (remainder)	$	54,038
2016	108,100
2017	108,100
2018	108,100
2019	108,100
Thereafter	576,141
Total	$	1,062,579