INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2019

Finite-Lived Intangible Assets, Net [Abstract]

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

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

	June 30, 2019								December 31, 2018
	Remaining	Gross							Gross
	Useful Life	Carrying		Accumulated			Net Book		Carrying		Accumulated			Net Book
Product rights	(In years)	Amount		Amortization			Value		Amount		Amortization			Value
NUCYNTA	6.5	$	1,019,978	$	(408,041	)	$	611,937	$	1,019,978	$	(360,891	)	$	659,087
CAMBIA	4.5	51,360		(28,459		)	22,901		51,360		(25,891		)	25,469
Zipsor	2.8	27,250		(20,876		)	6,374		27,250		(19,707		)	7,543
Total		$	1,098,588	$	(457,376	)	$	641,212	$	1,098,588	$	(406,489	)	$	692,099

Schedule of the future amortization expenses of intangible assets

Based on finite-lived intangible assets recorded as of June 30, 2019, 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):

	Estimated
	Amortization
Year Ending December 31,	Expense
2019 (remainder)	$	50,887
2020	101,774
2021	101,774
2022	99,969
Thereafter	286,808
Total	$	641,212