CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net income (loss)	$ 30,684	$ (5,002)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash PDL royalty revenue	(76,081)
Non-cash interest expense on liability related to sale of future royalties and milestones to PDL	10,282
Depreciation and amortization	6,070	2,592
Amortization of investments	200	(307)
Allowance for inventory obsolescence		154
Loss on disposal of property and equipment	17
Stock-based compensation	4,170	2,973
Contingent consideration and unfavorable contract fair value adjustment	1,226
Deferred income tax benefit	24,029
Excess tax benefit from stock-based compensation	(1,503)
Changes in assets and liabilities:
Accounts receivable	2,582	(1,091)
Inventories	2,363	2,207
Prepaid and other assets	(1,222)	890
Income taxes receivable	(2,373)
Accounts payable and other accrued liabilities	5,344	(3,383)
Accrued compensation	(2,287)	(985)
Income taxes payable	(60,372)
Deferred revenue	(1,520)	(1,752)
Net cash used in operating activities	(58,391)	(3,704)
Investing Activities
Purchases of property and equipment	(783)	(1,146)
Acquisition of patents		(150)
Purchases of marketable securities	(4,666)	(20,984)
Maturities of marketable securities	23,245	40,443
Sales of marketable securities		323
Net cash provided by (used in) investing activities	17,796	18,486
Financing Activities
Proceeds from issuance of common stock	5,564	1,076
Excess tax benefit from stock-based compensation	1,502
Net cash provided by financing activities	7,066	1,076
Net decrease in cash and cash equivalents	(33,529)	15,858
Cash and cash equivalents at beginning of period	244,674	29,076
Cash and cash equivalents at end of period	$ 211,145	$ 44,934