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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net loss $ (23,971) $ (118,204)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Stock-based compensation 11,885 18,030
Depreciation 11,566 9,583
Amortization of intangible assets 21,420 23,535
Non-cash interest expense and amortization of convertible debt issuance costs 13,369 10,856
Impairment of investment in non-marketable equity security 1,400   
Impairment of Goodwill, Intangible Assets and Property, Plant and Equipment 8,070 35,471
Deferred tax benefit 605 (39)
Non-cash restructuring 653 0
Gain from sale of intellectual property (1,388) 0
Change in operating assets and liabilities, net of effects of acquisitions:    
Accounts receivable (1,068) 574
Prepaid expenses and other assets 5,898 6,744
Accounts payable (399) (9,171)
Accrued salaries and benefits and other accrued liabilities (8,787) 3,968
Accrued litigation expenses (8,802) (467)
Income taxes payable 380 (665)
Net cash provided by (used in) operating activities 30,831 (19,785)
Cash flows from investing activities:    
Purchases of property, plant and equipment (5,942) (15,802)
Acquisition of intangible assets (2,500) (1,700)
Purchases of marketable securities (101,596) (77,562)
Maturities of marketable securities 97,300 149,486
Proceeds from sale of intellectual property 2,250 0
Acquisition of businesses, net of cash acquired 0 (46,278)
Net cash provided by (used in) investing activities (10,488) 8,144
Cash flows from financing activities:    
Proceeds from Convertible Debt 138,000 0
Payments of Debt Issuance Costs (3,603) 0
Proceeds received from issuance of common stock under employee stock plans 4,610 1,728
Principal payments against lease financing obligation (119) (17)
Payments under installment payment arrangement (84) (149)
Net cash provided by financing activities 138,804 1,562
Effect of exchange rate changes on cash and cash equivalents (170) 41
Net increase (decrease) in cash and cash equivalents 158,977 (10,038)
Cash and cash equivalents at beginning of period 148,984 162,244
Cash and cash equivalents at end of period 307,961 152,206
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities 252 2,686
Non-cash obligation for property, plant and equipment $ 0 $ 2,008