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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 230

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments and purchase accounting adjustments.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Balance Sheet Account Detail - Components of Intangible Assets Net of Accumulated Amortization (Detail) (USD $)	3 Months Ended		12 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	May 29, 2013
Product Rights [Line Items]
Historical Cost	$ 305,668,000		$ 305,668,000
Accumulated Amortization	(78,427,000)		(72,383,000)
Foreign Currency Translation	(4,452,000)		(2,162,000)
Impairment	(8,183,000)		(1,023,000)
Net Amount	214,606,000		230,100,000
Full Amortization Period (months)
Remaining Amortization Period (months)
Intangible asset amortization expense	14,000,000us-gaap_AmortizationOfIntangibleAssets	5,700,000us-gaap_AmortizationOfIntangibleAssets
MARQIBO IPR&D (NHL indication) [Member]
Product Rights [Line Items]
Historical Cost	17,600,000		17,600,000
Accumulated Amortization	0		0
Foreign Currency Translation	0		0
Impairment	0		0
Net Amount	17,600,000		17,600,000
EVOMELA IPR&D [Member]
Product Rights [Line Items]
Historical Cost	7,700,000		7,700,000
Accumulated Amortization	0		0
Foreign Currency Translation	0		0
Impairment	0		0
Net Amount	7,700,000		7,700,000
BELEODAQ distribution rights [Member]
Product Rights [Line Items]
Historical Cost	25,000,000		25,000,000
Accumulated Amortization	(1,407,000)		(937,000)
Foreign Currency Translation	0		0
Impairment	0		0
Net Amount	23,593,000		24,063,000
Full Amortization Period (months)	160 months
Remaining Amortization Period (months)	151 months
MARQIBO distribution rights [Member]
Product Rights [Line Items]
Historical Cost	26,900,000		26,900,000
Accumulated Amortization	(5,304,000)		(4,225,000)
Foreign Currency Translation	0		0
Impairment	0		0
Net Amount	21,596,000		22,675,000
Full Amortization Period (months)	81 months
Remaining Amortization Period (months)	60 months
FOLOTYN distribution rights [Member]
Product Rights [Line Items]
Historical Cost	118,400,000		118,400,000
Accumulated Amortization	(22,391,000)		(20,030,000)
Foreign Currency Translation	0		0
Impairment	0		0	(1,000,000)
Net Amount	96,009,000		98,370,000
Full Amortization Period (months)	152 months
Remaining Amortization Period (months)	122 months
ZEVALIN distribution rights [Member] \| United States [Member]
Product Rights [Line Items]
Historical Cost	41,900,000		41,900,000
Accumulated Amortization	(28,002,000)		(27,134,000)
Foreign Currency Translation	0		0
Impairment	0		0
Net Amount	13,898,000		14,766,000
Full Amortization Period (months)	123 months
Remaining Amortization Period (months)	48 months
ZEVALIN distribution rights [Member] \| Ex-U.S. [Member]
Product Rights [Line Items]
Historical Cost	23,490,000		23,490,000
Accumulated Amortization	(7,199,000)		(7,402,000)
Foreign Currency Translation	(4,452,000)		(2,162,000)
Impairment	0		0
Net Amount	11,839,000		13,926,000
Full Amortization Period (months)	96 months
Remaining Amortization Period (months)	60 months
FUSILEV distribution rights [Member]
Product Rights [Line Items]
Historical Cost	16,778,000		16,778,000
Accumulated Amortization	(7,058,000)		(6,270,000)
Foreign Currency Translation	0		0
Impairment	(7,160,000)		0
Net Amount	2,560,000		10,508,000
Full Amortization Period (months)	56 months
Remaining Amortization Period (months)	9 months
FOLOTYN out-License [Member]
Product Rights [Line Items]
Historical Cost	27,900,000		27,900,000
Accumulated Amortization	(7,066,000)		(6,385,000)
Foreign Currency Translation	0		0
Impairment	(1,023,000)		(1,023,000)
Net Amount	19,811,000		20,492,000
Full Amortization Period (months)	110 months
Remaining Amortization Period (months)	88 months
FUSILEV [Member]
Product Rights [Line Items]
Impairment	(7,200,000)
Intangible asset amortization expense	2,600,000
Other Intangible Assets [Member]
Product Rights [Line Items]
Intangible asset amortization expense	$ 6,900,000