CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net (loss) income	$ (33,286)	$ 30,684
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Non-cash PDL royalty revenue		(76,081)
Non-cash interest expense on PDL liability		10,282
Depreciation and amortization	30,292	6,070
Accretion of debt discount	7,387
Amortization of investments	277	200
Provision for inventory obsolescence	514
Loss on disposal of property and equipment	45	17
Stock-based compensation	6,066	4,170
Change in fair value of contingent consideration and unfavorable contract	(2,214)	1,226
Deferred income taxes (benefit) provision	(11,337)	24,029
Excess tax benefit from stock-based compensation	(2,273)	(1,503)
Changes in assets and liabilities:
Accounts receivable	(32,743)	2,582
Receivables from collaborative partners	322
Inventories	9,156	2,363
Prepaid and other assets	(2,256)	(1,222)
Income taxes receivable	(9,861)	(2,373)
Accounts payable and other accrued liabilities	59,132	5,344
Interest payable	18,160
Accrued compensation	(301)	(2,287)
Income taxes payable		(60,372)
Deferred revenue		(1,520)
Net cash provided by (used in) operating activities	37,080	(58,391)
Investing Activities
Purchases of property and equipment	(1,134)	(783)
Business acquisition (Note 13)	(1,050,000)
Purchases of marketable securities	(18,108)	(4,666)
Maturities of marketable securities	67,105	23,245
Net cash (used in) provided by investing activities	(1,002,137)	17,796
Financing Activities
Proceeds from the issuance of Senior Notes	562,063
Senior Notes issuance costs	(511)
Proceeds from issuance of common stock	6,658	5,564
Excess tax benefit from stock-based compensation	2,273	1,502
Net cash provided by financing activities	570,483	7,066
Net decrease in cash and cash equivalents	(394,574)	(33,529)
Cash and cash equivalents at beginning of period	488,668	244,674
Cash and cash equivalents at end of period	94,094	211,145
Cash paid during the period for:
Taxes, net of refunds	40	$ 58,000
Interest	4,121
Capitalized expenditures not paid	$ 437