CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net cash used in operating activities	$ (9,288)	$ (66,019)
Investing activities:
Purchases of short-term investments	(116,653)	(208,723)
Proceeds from the sale of short-term investments	142,681	298,177
Purchases of property, plant and equipment	(864)	(5,982)
Acquisition of licenses and other assets, net	(1,592)	(1,755)
Purchases of strategic investments		(359)
Net cash provided by investing activities	23,572	81,358
Financing activities:
Proceeds from issuance of equity	1,617	876
Proceeds from equipment financing arrangement	9,100	1,625
Principal payments on debt and capital lease obligations	(4,833)	(2,870)
Net cash (used in) provided by financing activities	5,884	(369)
Net increase in cash and cash equivalents	20,168	14,970
Cash and cash equivalents at beginning of period	65,477	70,052
Cash and cash equivalents at end of period	85,645	85,022
Supplemental disclosures of cash flow information:
Interest paid	2,275	2,398
Income taxes paid		2
Supplemental disclosures of non-cash investing and financing activities:
Amounts accrued for capital and patent expenditures	679	1,080
Capitalized costs and financing liability associated with leased facility		$ 48,575