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Components of Net Deferred Tax Asset (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Net operating loss carryforwards $ 653,896 $ 609,471
Research and development credits 70,091 65,315
Capitalized research 30,421 31,490
Milestone Rights 6,608  
Accrued expenses 3,578 2,922
Non-qualified stock option expense 41,219 30,928
Capitalized patent costs 7,811 6,891
Other 837  
Depreciation 2,539 3,134
Total net deferred tax assets 817,000 750,151
Valuation allowance (817,000) (750,151)
Net deferred tax assets