Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
		Dec. 17, 2014	Feb. 21, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Goodwill, net book value				$ 54,902	$ 52,585	$ 13,954
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				9,827	0	0
Net book value of intangible assets				57,375	57,375
Purchase Price Allocation [Abstract]
Goodwill				54,902	52,585	13,954
Business Acquisition, Pro Forma Information [Abstract]
Pro forma revenue					462,446	428,194
Pro forma net income					34,624	10,994
Assets:
In process research and development				42,501	60,628	41,800
Goodwill				54,902	52,585	13,954
Total assets				1,043,592	938,691	626,630
Liabilities:
Contingent consideration, net of current portion				23,046	34,599
Total liabilities				383,575	385,490
Cangene Corporation [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired			100.00%
Step up adjustment to inventory			$ 8,800
Price paid per share of acquisition (in dollars per share)			$ 3.24
Amortization period of step up adjustment			5 years
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Cash			$ 43,631
Accounts receivable			19,652
Inventory	[1]		55,259
Prepaid expenses and other assets			2,375
Property, plant and equipment			40,264
Deferred taxes, net			21,337
Income tax receivable			2,452
Accounts payable and accrued liabilities			(22,918)
Provision for chargebacks			(1,946)
Contingent consideration			(1,284)
Deferred revenue			(6,378)
Total fair value of tangible assets acquired and liabilities assumed			152,444
Acquired in-process research and development			8,300
Acquired intangible assets			36,200
Goodwill, net book value			24,566	$ 24,600
Total purchase price			221,510
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets			$ 36,200
Amortization period				110 months
Present value discount rate			16.00%
Transaction costs					3,700	$ 3,300
Purchase Price [Abstract]
Total purchase price			$ 221,510
Purchase Price Allocation [Abstract]
Acquired intangible assets			36,200
Goodwill			24,566	$ 24,600
Assets:
Goodwill			24,566	24,600
Cangene Corporation [Member] | Corporate Trade Name [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets			2,800
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets			$ 2,800
Amortization period			5 years
Present value discount rate			15.00%
Purchase Price Allocation [Abstract]
Acquired intangible assets			$ 2,800
Cangene Corporation [Member] | Marketed Products [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets			8,100
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets			$ 8,100
Amortization period			10 years
Present value discount rate			15.00%
Purchase Price Allocation [Abstract]
Acquired intangible assets			$ 8,100
Cangene Corporation [Member] | Licensed Products [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets			3,100
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets			$ 3,100
Amortization period			7 years
Present value discount rate			15.00%
Purchase Price Allocation [Abstract]
Acquired intangible assets			$ 3,100
Cangene Corporation [Member] | Biodefense Products [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets			16,700
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets			$ 16,700
Amortization period			12 years
Present value discount rate			15.00%
Purchase Price Allocation [Abstract]
Acquired intangible assets			$ 16,700
Cangene Corporation [Member] | Contract Manufacturing [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets			5,500
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets			$ 5,500
Amortization period			8 years
Present value discount rate			15.00%
Purchase Price Allocation [Abstract]
Acquired intangible assets			$ 5,500
EV 035 [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets		$ 10,528
Goodwill, net book value		12,601			52,585
Total purchase price		23,129
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets		$ 10,528
Present value discount rate		12.00%
Transaction costs		$ 0
Research and development contract costs		15,000
Contingent value rights based on the novation of the contract				4,000
Contingent value rights based on the achievement of certain development		15,000
Contingent value rights based on the regulatory filing milestones		50,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				9,800
Net book value of intangible assets				700
Change In Fair Value Of Contingent Obligations				(9,400)
Purchase Price [Abstract]
Amount of cash paid		1,500
Fair value of contingent purchase consideration		21,629
Total purchase price		23,129
Purchase Price Allocation [Abstract]
Acquired intangible assets		10,528
Goodwill		12,601			52,585
Total purchase price		23,129
Assets:
In process research and development					60,628
Goodwill		12,601			52,585
Total assets					113,213
Liabilities:
Contingent consideration, net of current portion					34,599
Total liabilities					34,599
EV 035 [Member] | Previously Reported [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Goodwill, net book value					41,984
Purchase Price Allocation [Abstract]
Goodwill					41,984
Assets:
In process research and development					77,800
Goodwill					41,984
Total assets					119,784
Liabilities:
Contingent consideration, net of current portion					41,170
Total liabilities					41,170
EV 035 [Member] | EV-035 Purchase Price Adjustments [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Goodwill, net book value					10,601
Purchase Price Allocation [Abstract]
Goodwill					10,601
Assets:
In process research and development					(17,172)
Goodwill					10,601
Total assets					(6,571)
Liabilities:
Contingent consideration, net of current portion					(6,571)
Total liabilities					$ (6,571)
EV 035 [Member] | Preliminary Purchase Price [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Total purchase price		29,700
Purchase Price [Abstract]
Amount of cash paid		1,500
Fair value of contingent purchase consideration		28,200
Total purchase price		29,700
EV 035 [Member] | Preliminary Allocation [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets		27,700
Goodwill, net book value		2,000
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets		27,700
Purchase Price Allocation [Abstract]
Acquired intangible assets		27,700
Goodwill		2,000
Total purchase price		29,700
Assets:
Goodwill		2,000
EV 035 [Member] | Measurement Period Adjustment [Member]
Fair value of tangible assets acquired and liabilities assumed [Abstract]
Acquired intangible assets		(17,172)
Goodwill, net book value		10,601
Total purchase price		(6,571)
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Acquired intangible assets		(17,172)
Purchase Price [Abstract]
Amount of cash paid		0
Fair value of contingent purchase consideration		(6,571)
Total purchase price		(6,571)
Purchase Price Allocation [Abstract]
Acquired intangible assets		(17,172)
Goodwill		10,601
Total purchase price		(6,571)
Assets:
Goodwill		$ 10,601
EV 035 [Member] | Minimum [Member]
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Sales-based royalty payments		5.00%
EV 035 [Member] | Maximum [Member]
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Sales-based royalty payments		10.00%
EV-035 Research and Development [Member]
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Change In Fair Value Of Contingent Obligations				(6,200)
EV-035 Selling, General and Administrative Member [Member]
Summary of the preliminary estimated fair value of intangible assets acquired and the estimated amortization periods [Abstract]
Change In Fair Value Of Contingent Obligations				$ (3,200)

[1] Acquired inventory reflects a $6.2 million adjustment to record inventory at fair value, referred to as a step-up adjustment. The $6.2 million step-up is estimated to be amortized through cost of product sales and contract manufacturing over the next five years based on expected inventory turnover, which will increase cost of product sales and contract manufacturing during such period.