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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net loss $ (118,204) $ (14,337)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Impairment of goodwill and long-lived assets 35,471 0
Stock-based compensation 18,030 21,538
Depreciation 9,583 8,588
Amortization of intangible assets 23,535 12,908
Non-cash interest expense and amortization of convertible debt issuance costs 10,856 9,326
Deferred tax benefit (39) (3,413)
Non-cash acquistion of patents 0 (3,000)
Change in operating assets and liabilities, net of effects of acquisitions:    
Accounts receivable 574 2,823
Prepaid expenses and other assets 6,744 5,550
Accounts payable (9,171) 12,559
Accrued salaries and benefits and other accrued liabilities 4,009 (9,475)
Accrued litigation expenses (467) 5,770
Income taxes payable (665) 2,174
Net cash provided by (used in) operating activities (19,744) 51,011
Cash flows from investing activities:    
Acquisition of business, net of cash acquired (46,278) (167,381)
Purchases of marketable securities (77,562) (94,189)
Maturities of marketable securities 149,486 254,322
Purchases of property, plant and equipment (15,802) (14,950)
Acquisition of intangible assets (1,700) (210)
Proceeds from sale of marketable security 0 11
Net cash provided by (used in) investing activities 8,144 (22,397)
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 1,728 9,482
Payments under installment payment arrangement (149) (861)
Principal payments against lease financing obligation (17) (453)
Proceeds from landlord for tenant improvements 0 8,800
Payment to redeem contingently redeemable common stock pursuant to the settlement agreement with Samsung 0 (100,000)
Net cash provided by financing activities 1,562 (83,032)
Net decrease in cash and cash equivalents (10,038) (54,418)
Cash and cash equivalents at beginning of period 162,244 215,262
Cash and cash equivalents at end of period 152,206 160,844
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities 2,686 1,194
Non-cash obligation for property, plant and equipment 2,008 0
Common stock issued pursuant to acquisition $ 0 $ 88,438