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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenue:        
Royalties $ 57,009 $ 55,723 $ 123,231 $ 117,766
Contract revenue 910 492 1,554 1,312
Total revenue 57,919 56,215 124,785 119,078
Operating costs and expenses:        
Cost of revenue 7,365 [1] 7,340 [1] 13,899 [1] 14,503 [1]
Research and development 30,777 [1] 38,347 [1] 63,625 [1] 76,741 [1]
Marketing, general and administrative 14,134 [1] 32,194 [1] 39,239 [1] 67,028 [1]
Gain from sale of intellectual property (103) 0 (1,388) 0
Costs of restatement and related legal activities 2 83 19 113
Restructuring charges 0 0 2,206 0
Total operating costs and expenses 52,175 77,964 117,600 158,385
Operating income (loss) 5,744 (21,749) 7,185 (39,307)
Interest income and other income (expense), net (1,419) 89 (1,439) 187
Interest expense (7,426) (6,719) (14,738) (13,299)
Interest and other income (expense), net (8,845) (6,630) (16,177) (13,112)
Loss before income taxes (3,101) (28,379) (8,992) (52,419)
Provision for income taxes 4,743 3,837 9,254 7,687
Net loss $ (7,844) $ (32,216) $ (18,246) $ (60,106)
Net loss per share:        
Basic (in dollars per share) $ (0.07) $ (0.29) $ (0.16) $ (0.54)
Diluted (in dollars per share) $ (0.07) $ (0.29) $ (0.16) $ (0.54)
Weighted average shares used in per share calculation:        
Basic (in shares) 112,183 110,553 111,892 110,456
Diluted (in shares) 112,183 110,553 111,892 110,456
[1] Includes stock-based compensation