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Income Taxes (Reconciliation Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 264,183 $ 235,659
Research and development credits 32,043 28,346
Depreciation 1,170 1,403
Accruals and reserves 20,088 20,385
Total deferred tax assets 317,484 285,793
Less: Valuation allowance (317,412) (285,556)
Deferred tax liabilities:    
Deferred rent (72) (237)
Net deferred tax assets