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Component of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Net operating loss carry forwards $ 127,529 $ 103,119
Research tax credit carry forwards 18,163 17,477
Accruals and reserves 8,529 6,818
Capitalized research costs 12,757 17,278
Deferred revenue 2,180 2,189
Other 1,221 1,455
Deferred Tax Assets, Gross, Total 170,379 148,336
Less valuation allowance (170,232) (148,266)
Total deferred tax assets 147 70
Deferred tax liabilities:    
Acquired intangible assets (86) (27)
Other (61) (43)
Total deferred tax liabilities (147) (70)
Net deferred tax assets